The standard view of rationality distinguishes between instrumental rationality and the rationality of ends. We discuss this conception briefly before introducing an alternative theory. According to it, means and ends are interconnected so that the means will produce the ends. In other words, the means are used to shape our ends. We describe and discuss this view, asking whether it can be called rationality. It is clear that this alternative view has many irrational features. But at the same time it (...) is clear that much of our technological culture is based on this view so that also it is hampered by the emerging irrationality. We conclude by discussing the case of genetic engineering as a technology we cannot possibly accept. Its characteristic ends may be of a wrong type. (shrink)