Both Martin Heidegger and Eugen Fink have used the platonic "allegory of the cave" to explicate certain aspects of Edmund Husserl's phenomenological philosophy. Heidegger's discussion of the allegory comes in his 1930 Freiburg Lecture, "Platon's Lehre von der Wahrheit". ¹ Without ever specifically naming Husserl, Heidegger uses the allegory to show why Husserl's phenomenology is "inadequate" as truly radical philosophy.