 One of the most intriguing aspects of Hartmann’s theory of strata is the question of what kinds of relation connect the strata to each other. Two general relations seem to govern strata relations, and these are further specified by the “categorial laws.” The two basic relations between strata are termed relations of superformation (Überformung) and superposition (Überbauung) (A51f). Consider the superformation between molecules and cells, i.e., between the physical and the biological levels of reality. It accounts for the fact that even if organisms are unquestionably more complex than mechanisms, the behavior of organisms is in conformity with laws of mechanics (A51b). At the same time, mechanical regularities are superformed by being incorporated into organic ones. The relation between the psychological and spiritual levels is different, because they are characterized by an interruption in the categorial series and by the onset of a new categorial coherence. The relations between the biological and the psychological stratum, on the one hand, and the relation between the psychological and the spiritual stratum, on the other, are both relations of superposition. The group of categories embedded in psychological entities is different from the group of categories embedded in biological entities. Similarly, the group of categories embedded in spiritual entities is different from the group of categories embedded in psychological entities.