The aim of Huizinga's study is to try to integrate the concept of play into that of culture. He approaches play from a historical, not scientific point and, his study does not use psychological interpretations of play.

Sein und Zeit published by Martin Heidegger in 1929, conceals a number of important and interesting thoughts behind cryptic style and many neologisms. My book extracts some key theses from this hermetic text and provides arguments for them. (Heidegger does not argue.) It shows that a good philosopher hides behind this often perplexing text.

The Anaximander fragment -- Logos (Heraclitus, fragment B 50) -- Moira (Parmenides VIII, 34-41) -- Aletheia (Heraclitus, fragment B 16).