Abstract

Husserl credited Riemann for bringing the modern idea of “mathesis universalis‘ to its realization. Going beyond the logical ideal of a theory of all possible forms of theories, this paper explores the phenomenological sense of intrinsically physical geometry. Starting from Kant, how can we follow the thread of transcendental idealism in the search for the hidden presuppositions of this kind of geometry? This is achieved by reflecting on the paradigmatic experience of the earth at rest in our primary lifeworld.