In this work we try to distinguish five levels of the constitution of reality in Conrad Martius’ Realontologie (1923) (Real Ontology). The difference between “existential autonomy” and “existential relativity” seems to be the first one. The second level of the constitution of reality concerns the problem of “whatness” (Washeit) and the substantial reality (Realität). We can find the third level in the materiality from the eidetical point of view. The fourth level of the constitution of reality concerns the material formation (...) as presupposition of a personal essence. Finally we can distinguish a fifth level of the constitution of the reality in the essential stratification. (shrink)