Creativity has often been declared, especially by philosophers, as the last frontier of science. The assumption is that it will defy explanation forever. I will defend two claims in order to oppose this assumption and to demystify creativity: (1) the perspective that creativity cannot be explained wrongly identifies creativity with what I shall call metaphysical freedom; (2) the Darwinian approach to creativity, a prominent naturalistic account of creativity, fails to give an explanation of creativity, because it confuses conceptual issues with (...) explanation. I will close with some remarks on the status and differences in some explanations available in contemporary cognitive science. (shrink)

A political discourse of peace marked the distribution and use of radioisotopes in biomedical research and in medical diagnosis and therapy in the post-World War II period. This occurred during the era of expansion and strengthening of the United States' influence on the promotion of sciences and technologies in Europe as a collaborative effort, initially encouraged by the policies and budgetary distribution of the Marshall Plan. This article follows the importation of radioisotopes by two Spanish research groups, one in experimental (...) endocrinology and one in molecular biology. For both groups foreign funds were instrumental in the early establishment of their laboratories. The combination of funding and access to previously scarce radioisotopes helped position these groups at the forefront of research in Spain. (shrink)

I argue that creativity is compatible with determinism and therefore with naturalistic explanation. I explore different kinds of novelty, corresponding with four distinct concepts of creativity – anthropological, historical, psychological and metaphysical. Psychological creativity incorporates originality and spontaneity. Taken together, these point to the independence of the creative mind from social learning, experience and previously acquired knowledge. This independence is nevertheless compatible with determinism. Creativity is opposed to specific causal factors, but it does not exclude causal determination as such. So (...) creativity can be naturalized. (shrink)

This essay presents the early days of human cytogenetics, from the late 1950s until the mid 1970s, as a historical series of images. I propose a chronology moving from photographs of bodies to chromosome sets, to be joined by ultrasound images, which provided a return to bodies, by then focused on the unborn. Images carried ontological significance and, as I will argue, are principal characters in the history of human cytogenetics. Inspired by the historiography of heredity and genetics, studies on (...) visual cultures, the conceptualization of circulation, and the sociology of pregnancy, I suggest that cytogenetics, through its focus on pregnancy, pregnant women, and their offspring, found strategic living materials that stabilized human chromosome studies as a biomedical, post-eugenics practice. The historicity of each path displays a wide circulation of objects, tools, and methods that condensed on images that shared in the centuries-old visual expertise that medicine and botany had manufactured. (shrink)

Recent philosophical work on the concept of human nature disagrees on how to respond to the Darwinian challenge, according to which biological species do not have traditional essences. Three broad kinds of reactions can be distinguished: conservative intrinsic essentialism, which defends essences in the traditional sense, eliminativism, which suggests dropping the concept of human nature altogether, and constructive approaches, which argue that revisions can generate sensible concepts of human nature beyond traditional essences. The different constructive approaches pick out one or (...) two of the three epistemic roles that are fused in traditional essentialist conceptions of human nature: descriptive, explanatory, definitional, or explanatory and definitional. These turns towards diverging epistemic roles are best interpreted pluralistically: there is a plurality of concepts of human nature that have to be clearly distinguished, each with a legitimate role in respective scientific contexts. (shrink)

In the face of causal complexity, scientists reconstitute phenomena in order to arrive at a more simplified and partial picture that ignores most of the 'bigger picture.' This paper will distinguish between two modes of reconstituting phenomena: one moving down to a level of greater decomposition (toward organizational parts of the original phenomenon), and one moving up to a level of greater abstraction (toward different differences regarding the phenomenon). The first aim of the paper is to illustrate that phenomena are (...) moving targets, i.e., they are not fixed once and for all, but are adapted, if necessary, on the basis of the preferred perspective adopted for pragmatic reasons. The second aim is to analyze in detail the second mode of reconstituting phenomena. This includes an exposition of the kind of pragmatic-pluralistic picture resulting from the fact that phenomena are reconstituted by a move up to a level of greater abstraction. (shrink)

The book examines how Darwinism has been used to explain novelty and change in culture through the Darwinian approach to creativity and the theory of memes. The first claims that creativity is based on a Darwinian process of blind variation and selection, while the latter claims that culture is based on and explained by units - memes - that are similar to genes. Both theories try to describe and explain mind and culture by applying Darwinism by way of analogies. Kronfeldner (...) shows that the analogies involved in these theories lead to claims that give either wrong or at least no new descriptions or explanations of the phenomena at issue. Whereas the two approaches are usually defended or criticized on the basis that they are dangerous for our vision of ourselves, this book takes a different perspective: it questions the acuteness of these approaches. Darwinian theory is not like a dangerous wolf, hunting for our self image. Far from it, in the case of the two analogical applications addressed in this book, Darwinian theory is shown to behave more like a disoriented sheep in wolf's clothing. - A revised and much shortened version of a dissertation (2007, Darwinism, Memes and Creativity: A Critique of Analogical Reasoning from Nature to Culture). (shrink)

Over the last four decades arguments for and against the claim that creative hypothesis formation is based on Darwinian ‘blind’ variation have been put forward. This paper offers a new and systematic route through this long-lasting debate. It distinguishes between undirected, random, and unjustified variation, to prevent widespread confusions regarding the meaning of undirected variation. These misunderstandings concern Lamarckism, equiprobability, developmental constraints, and creative hypothesis formation. The paper then introduces and develops the standard critique that creative hypothesis formation is guided (...) rather than blind, integrating developments from contemporary research on creativity. On that basis, I discuss three compatibility arguments that have been used to answer the critique. These arguments do not deny guided variation but insist that an important analogy exists nonetheless. These compatibility arguments all fail, even though they do so for different reasons: trivialisation, conceptual confusion, and lack of evidence respectively. Revisiting the debate in this manner not only allows us to see where exactly a ‘Darwinian’ account of creative hypothesis formation goes wrong, but also to see that the debate is not about factual issues, but about the interpretation of these factual issues in Darwinian terms. (shrink)

This paper argues that the so-called ‘paradox’ of dehumanization is a mirage arising from misplaced abstraction. The alleged ‘paradox’ is taken as a challenge that arises from a skeptical stance. After reviewing the history of that skeptical stance, it is reconstructed as an argument with two premises. With the help of an epistemologically structured but pluralistic frame it is then shown how the two premises of the Skeptic’s argument can both be debunked. As part of that it emerges that there (...) are a couple of ways how dehumanization can be realized, and one such realization can be sufficient for affirming the reality of dehumanization for a specific case. (shrink)

Human nature is a concept that transgresses the boundary between science and society and between fact and value. It is as much a political concept as it is a scientific one. This chapter will cover the politics of human nature by using evidence from history, anthropology and social psychology. The aim is to show that an important political function of the vernacular concept of human nature is social demarcation (inclusion/exclusion): it is involved in regulating who is ‘us’ and who is (...) ‘them.’ It is a folk concept that is used for dehumanization, for denying (a) membership in humankind or (b) full humanness to certain people in order to include or exclude them from various forms of politically relevant aspects of human life, such as rights, power, etc. (shrink)

Continuing Franz Boas' work to establish anthropology as an academic discipline in the US at the turn of the twentieth century, Alfred L. Kroeber re-defined culture as a phenomenon sui generis. To achieve this he asked geneticists to enter into a coalition against hereditarian thoughts prevalent at that time in the US. The goal was to create space for anthropology as a separate discipline within academia, distinct from other disciplines. To this end he crossed the boundary separating anthropology from biology (...) in order to secure the boundary. His notion of culture, closely bound to the concept of heredity, saw it as independent of biological heredity (culture as superorganic) but at the same time as a heredity of another sort. The paper intends to summarise the shifting boundaries of anthropology at the beginning of the twentieth century, and to present Kroeber?s ideas on culture, with a focus on how the changing landscape of concepts of heredity influenced his views. The historical case serves to illustrate two general conclusions: that the concept of culture played and plays different roles in explaining human existence; that genetics and the concept of Weismannian hard inheritance did not have an unambiguous unidirectional historical effect on the vogue for hereditarianism at that time; on the contrary, it helped to establish culture in Kroeber's sense, culture as independent of heredity. (shrink)

This paper spells out the ways in which we need to be pluralists about “human nature”. It discusses a conceptual pluralism about the concept of “human nature”, stemming from post-essentialist ontology and the semantic complexity of the term “nature”; a descriptive pluralism about the “descriptive nature” of human beings, which is a pluralism regarding our self-understanding as human beings that stems from the long list of typical features of, and relations between, human beings; a natural kind term pluralism, which is (...) a pluralism that concerns the choices we have in deciding how to apply the kind term “human”; and an explanatory pluralism that results from the causal complexity of life. Because of the complexity of being human, which gives rise to these pluralisms, being human is, the paper claims, a kaleidoscopic affair, and one far from concerning the life sciences only. (shrink)

This paper addresses whether the often-bemoaned loss of unity of knowledge about humans, which results from the disciplinary fragmentation of science, is something to be overcome. The fragmentation of being human rests on a couple of distinctions, such as the nature-culture divide. Since antiquity the distinction between nature (roughly, what we inherit biologically) and culture (roughly, what is acquired by social interaction) has been a commonplace in science and society. Recently, the nature/culture divide has come under attack in various ways, (...) in philosophy as well as in cultural anthropology. Regarding the latter, for instance, the divide was quintessential in its beginnings as an academic dis-cipline, when Alfred L. Kroeber, one of the first professional anthropologists in the US, rallied for (what I call) the right to ignore—in his case, human nature—by adopting a separationist epistemic stance. A separationist stance will be understood as an epistemic research heuristic that defends the right to ignore a specif-ic phenomenon (e.g., human nature) or a specific causal factor in an explanation typical for a disciplinary field. I will use Kroeber’s case as an example for making a general point against a bias towards integration (synthesis bias, as I call it) that is exemplified, for instance, by defenders of evolutionary psychology. I will claim that, in principle, a separationist stance is as good as an integrationist stance since both can be equally fruitful. With this argument from fruitful sepa-ration in place, not just the separationist stance but also the nature/culture di-vide can be defended against its critics. (shrink)

The article addresses the question whether culture evolves in a Lamarckian manner. I highlight three central aspects of a Lamarckian concept of evolution: the inheritance of acquired characteristics, the transformational pattern of evolution, and the concept of directed changes. A clear exposition of these aspects shows that a system can be a Darwinian variational system instead of a Lamarckian transformational one, even if it is based on inheritance of acquired characteristics and/or on Lamarckian directed changes. On this basis, I apply (...) the three aspects to culture. Taking for granted that culture is a variational system, based on selection processes, I discuss in detail the senses in which cultural inheritance can be said to be Lamarckian and in which sense problem solving, a major factor in cultural change, leads to directed variation. (shrink)

This essay provides a summary of the steps taken to build a critical thinking based faculty learning community (CTB-FLC) on the Lone Star College – CyFair campus across various disciplines. The author shares the motivations driving this project, the challenges and successes of the ten participating members, and the plans for future CTB-FLCs. The primary purpose of this essay is to encourage other colleges to build similar critical thinking based faculty learning communities as professional development opportunities on their campuses. The (...) essay culminates with a set of recommendations which result from the lessons learned during the implementation of a CTB-FLC from 2008 to 2010 at Lone Star College – CyFair. (shrink)

This article illustrates in which sense genetic determinism is still part of the contemporary interactionist consensus in medicine. Three dimensions of this consensus are discussed: kinds of causes, a continuum of traits ranging from monogenetic diseases to car accidents, and different kinds of determination due to different norms of reaction. On this basis, this article explicates in which sense the interactionist consensus presupposes the innate?acquired distinction. After a descriptive Part 1, Part 2 reviews why the innate?acquired distinction is under attack (...) in contemporary philosophy of biology. Three arguments are then presented to provide a limited and pragmatic defense of the distinction: an epistemic, a conceptual, and a historical argument. If interpreted in a certain manner, and if the pragmatic goals of prevention and treatment are taken into account, then the innate?acquired distinction can be a useful epistemic tool. It can help, first, to understand that genetic determination does not mean fatalism, and, second, to maintain a system of checks and balances in the continuing nature?nurture debates. (shrink)

This paper has two aims. First, to bring together the models of temporal phenomenology on offer and to present these using a consistent set of distinctions and terminologies. Second, to examine the methodologies currently practiced in the development of these models. To that end we present an abstract characterisation in which we catalogue all extant models. We then argue that neither of the two extreme methodologies currently discussed is suitable to the task of developing a model of temporal phenomenology. An (...) entirely top-down methodology is largely insensitive to empirical findings, while one that is entirely bottom-up is insensitive to both introspective evidence and more general philosophical considerations. We recommend a methodology that falls between these two extremes. (shrink)

ABSTRACTIn this paper, I argue for an Aristotelian way of accommodating supererogation within virtue ethics by retrieving an account of moral heroism and providing a picture of different degrees of virtue. This, I claim, is the most appropriate virtue-ethical background allowing us to talk about supererogation without falling prey to several dangers. After summarizing the main attempts to deny the compatibility of virtue and supererogation, I will present some recent proposals to accommodate supererogation within virtue ethics. Next, I will argue (...) that these proposals raise substantial worries. I will then offer an analysis of heroism and the degrees of virtue to outline my own alternative definition of supererogation in terms of heroic virtue. (shrink)

Academic freedom has often been defended in a progressivist manner: without academic freedom, creativity would be in peril, and with it the advancement of knowledge, i.e. the epistemic progress in science. In this paper, I want to critically discuss the limits of such a progressivist defense of academic freedom, also known under the label ‘argument from truth.’ The critique is offered, however, with a constructive goal in mind, namely to offer an alternative account that connects creativity and academic freedom in (...) a way that goes beyond mere reference to epistemic progress and involves reference to the freedom to think independently as the freedom we mean when we point to creativity and when we point to academic freedom. The resulting causal independence account is not only epistemologically stronger than a progressivist account, it also allows to counter the curbing of academic freedom in the name of progress. The latter becomes key, for instance, when authoritarian political regimes limit or negate academic freedom with reference to an epistemic progress suitably defined for that regime. (shrink)

A celebrated study of the origins of ancient Greek philosophy, now in English for the first time How can we talk about the beginnings of philosophy today? How can we avoid the conventional opposition of mythology and the dawn of reason and instead explore the multiple styles of thought that emerged between them? In this acclaimed book, available in English for the first time, Maria Michela Sassi reconstructs the intellectual world of the early Greek "Presocratics" to provide a richer (...) understanding of the roots of what used to be called "the Greek miracle." The beginnings of the long process leading to philosophy were characterized by intellectual diversity and geographic polycentrism. In the sixth and fifth centuries BC, between the Asian shores of Ionia and the Greek city-states of southern Italy, thinkers started to reflect on the cosmic order, elaborate doctrines on the soul, write in solemn Homeric meter, or, later, abandon poetry for an assertive prose. And yet the Presocratics whether the Milesian natural thinkers, the rhapsode Xenophanes, the mathematician and "shaman" Pythagoras, the naturalist and seer Empedocles, the oracular Heraclitus, or the inspired Parmenides all shared an approach to critical thinking that, by questioning traditional viewpoints, revolutionized knowledge. A unique study that explores the full range of early Greek thinkers in the context of their worlds, the book also features a new introduction to the English edition in which the author discusses the latest scholarship on the subject. (shrink)

En este artículo se repasan algunas de las líneas de investigación más influyentes en el área de los estudios sobre biología y género y libros publicados al respecto por un grupo creciente de autoras. Como es habitual entre los estudios de género, en este caso los referentes a la biología cuentan con estudios sobre investigadoras en el área de la biología, mujeres que participaron activamente en la generación de saberes y prácticas de esta disciplina, por una parte, y con trabajos (...) sobre los sesgos epistémicos de género y sobre el androcentrismo en el conocimiento biológico, por otra. La genealogía se relaciona con la autoridad y ésta con el género como agencia en las ciencias y las experimentaciones contemporáneas. (shrink)

This study was aimed at predicting individual differences in text reading fluency. The basic proposal included two factors, i.e., the ability to decode letter strings (measured by discrete pseudo-word reading) and integration of the various sub-components involved in reading (measured by Rapid Automatized Naming, RAN). Subsequently, a third factor was added to the model, i.e., naming of discrete digits. In order to use homogeneous measures, all contributing variables considered the entire processing of the item, including pronunciation time. The model, which (...) was based on commonality analysis, was applied to data from a group of 43 typically developing readers (11- to 13-year-olds) and a group of 25 chronologically matched dyslexic children. In typically developing readers, both orthographic decoding and integration of reading sub-components contributed significantly to the overall prediction of text reading fluency. The model prediction was higher (from ca. 37% to 52% of the explained variance) when we included the naming of discrete digits variable, which had a suppressive effect on pseudo-word reading. In the dyslexic readers, the variance explained by the two-factor model was high (69%) and did not change when the third factor was added. The lack of a suppression effect was likely due to the prominent individual differences in poor orthographic decoding of the dyslexic children. Analyses on data from both groups of children were replicated by using patches of colours as stimuli (both in the RAN task and in the discrete naming task) obtaining similar results. We conclude that it is possible to predict much of the variance in text-reading fluency using basic processes, such as orthographic decoding and integration of reading sub-components, even without taking into consideration higher-order linguistic factors such as lexical, semantic and contextual abilities. The approach validity of using proximal vs distal causes to predict reading fluency is discussed. (shrink)

The term ‘human nature’ can refer to different things in the world and fulfil different epistemic roles. Human nature can refer to a classificatory nature (classificatory criteria that determine the boundaries of, and membership in, a biological or social group called ‘human’), a descriptive nature (a bundle of properties describing the respective group’s life form), or an explanatory nature (a set of factors explaining that life form). This chapter will first introduce these three kinds of ‘human nature’, together with seven (...) reasons why we disagree about human nature. In the main, this chapter focuses on the explanatory concept of human nature, which is related to one of the seven reasons for disagreement, namely, the scientific authority inherent in the term ‘nature’. I will examine why, in a number of historical contexts, it was attractive to refer to ‘nature’ as an explanatory category, and why this usage has led to the continual contestation of the term within the sciences. The claim is that even if the contents of talk about ‘nature’ varied historically, the term’s pragmatic function of demarcation stayed the same. The term ‘nature’ conveys scientific authority over a territory; ‘human nature’ is a concept used to divide causes, as well as experts, and thereby conquer others who threaten to invade one’s epistemic territory. Analysing this demarcation, which has social as well as epistemic aspects, will help us to understand why the explanatory role has been important and why it is unlikely that people will ever agree on either the meaning or the importance of ‘human nature’ as an explanatory category. (shrink)

This article illustrates in which sense genetic determinism is still part of the contemporary interactionist consensus in medicine. Three dimensions of this consensus are discussed: kinds of causes, a continuum of traits ranging from monogenetic diseases to car accidents, and different kinds of determination due to different norms of reaction. On this basis, this article explicates in which sense the interactionist consensus presupposes the innate?acquired distinction. After a descriptive Part 1, Part 2 reviews why the innate?acquired distinction is under attack (...) in contemporary philosophy of biology. Three arguments are then presented to provide a limited and pragmatic defense of the distinction: an epistemic, a conceptual, and a historical argument. If interpreted in a certain manner, and if the pragmatic goals of prevention and treatment (ideally specifying what medicine and health care is all about) are taken into account, then the innate?acquired distinction can be a useful epistemic tool. It can help, first, to understand that genetic determination does not mean fatalism, and, second, to maintain a system of checks and balances in the continuing nature?nurture debates. (shrink)

This paper focuses on Aristotelian phronesis and aims at highlighting its nature as an eye on particulars with general ends in sight. More specifically, it challenges the particularistic interpretation of phronesis and Aristotelian ethics in order to argue for a “qualified generalism.” After sketching a radical Particularistic Reading (PR), the paper defends an interpretation it calls the Priority of Particulars Reading (PPR). First, it shows how PPR effectively accounts for the Aristotelian priority assigned to practical perception while at the same (...) time counterbalancing that priority by means of two interpretive strategies. Then it offers further support to PPR by appealing to its own reading of Aristotle's phronesis. It aims to show that it is possible to defend a legitimate form of PPR without ending in holding PR, and that Aristotle's own theory and work ground the moderate reading. Finally, it draws some implications by analyzing educational practice. (shrink)

To have a well-functioning principle of academic freedom, we need to distin-guish critique from an infringement of academic freedom. To achieve this goal, this paper presents three necessary conditions for something to be an infringe-ment of academic freedom. These conditions allow to delineate cases in which at least one of the three conditions is not fulfilled. These are contrast cases that might – at first glance – look like infringements of academic freedom but are, in fact, not so. I will (...) refer to five such kinds of contrast cases: (1) discrimination and thus a more general kind of unjust treatment of a person engaged in aca-demic affairs, (2) infringement of freedom of speech or other non-academic intel-lectual freedoms, (3) mere critique, (4) justified critique that leads to justified limitations of someone’s academic freedom, and (5) cases of deep disagreement. Special attention will be given to vulnerabilities concerning unjustified silencing of critique, which haunt fields that lack clear and agreed-on ethical or academic standards. (shrink)

Three studies were conducted to examine the relation of spatial visualization to solving kinematics problems that involved either predicting the two‐dimensional motion of an object, translating from one frame of reference to another, or interpreting kinematics graphs. In Study 1, 60 physics‐naíve students were administered kinematics problems and spatial visualization ability tests. In Study 2, 17 (8 high‐ and 9 low‐spatial ability) additional students completed think‐aloud protocols while they solved the kinematics problems. In Study 3, the eye movements of fifteen (...) (9 high‐ and 6 low‐spatial ability) students were recorded while the students solved kinematics problems. In contrast to high‐spatial students, most low‐spatial students did not combine two motion vectors, were unable to switch frames of reference, and tended to interpret graphs literally. The results of the study suggest an important relationship between spatial visualization ability and solving kinematics problems with multiple spatial parameters. (shrink)

We study twentieth-century biological sciences as experimental sciences by historically reconstructing the uses of experiments. Concepts like artificial, natural, and inventions, are handled so as to show how much current biological thought has been constructed on the basis of the invention of different kinds of experiments, instruments, and technical devices, experimental systems, and ideas concerning the fonctioning of nature. It is suggested that the frontier that may separate the natural from the artificial has already been crossed. Human intervention in the (...) natural phenomena through reproducible experiments hints to a view of current biological knowledge as a permanent invention of nature. (shrink)

This paper is on the problem of causal selection and comments on Collingwood's classic paper "The so-called idea of causation". It discusses the relevance of Collingwood’s control principle in contemporary life sciences and defends that it is not the ability to control, but the willingness to control that often biases us towards some rather than other causes of a phenomenon. Willingness to control is certainly only one principle that influences causal selection, but it is an important one. It shows how (...) norms make causes. (shrink)

El artículo ofrece una caracterización de las constantes lógicas, [CL], analizando el significado de las expresiones que son sus contrapartidas en el lenguaje natural. [CL] recoge los rasgos sintácticos, semánticos y pragmáticos individualmente necesarios y conjuntamente suficientes para que una expresión sea una constante lógica. Se obtendrá la siguiente conclusión: que la lista de las expresiones que habitualmente se consideran constantes lógicas no comparten rasgos relevantes desde el punto de vista del significado que justifiquen su tratamiento como un grupo homogéneo. (...) Sólo algunos usos del condicional, de la negación y de ciertos cuantificadores son constantes lógicas genuinas. (shrink)

The papers collected here comprise the proceedings of a Workshop in honor ofMerrilee and Wes Salmon, held in Florence on May 17-18, 1996. The aim of the meeting was to pay homage to these two American scholars, whose contact with Italian and European Universities and Institutes had a major influence on "Continental" thought in the field of epistemology and probability. In fact, Merrilee and Wes spent various periods lecturing at the Universities of Bologna, Florence, Rome, Trieste, Catania and Pisa, as (...) well as in the University of Constance, where they helped to build a strong cultural "bridge" with the Pittsburgh Center for the Philosophy of Science. The Florence Center for the History and Philosophy of Science is particularly thankful to the Salmons for their ongoing cooperation and frequent visits. We must not forget that Wes Salmon was in the Florence Center and at the Philosophy Department of Florence, as visiting scholar, on many occasions, and that he made important contributions which have later appeared in Italian journals, such as Iride and Rivista di jilosojia. Merrilee was a speaker at the Conference on "Genetics, Linguistics, and Archaeology" (May 20-24,1991), organized by the Florence Center. Both Wes and Merrilee often enlivened the arguments of the initiatives they took part in. (shrink)

The object of this paper is to demonstrate the philological relation between justice, law and equality in ancient Greek or, that is the same, the philosophical relation between ethics, politics and economics. Actually it is interesting to examine the etymology of the word dikē which derives from the Sanskrit diś-(dik) and it refers more than to the generic idea of the «straight line» to the specific and astronomical concept of the «horizon (or skyline)», the apparent line that separates the cosmos (...) into two equal parts, the earth from the sky, meaning the same idea of equality which should be a rule of just law and ethical perfection. Moreover, according to my hypothesis Plato may have used the analogy of the horizon to explain his cosmological Doctrine of Ideas. (shrink)