Cursiously, in his "You must change your life" monograph, Sloterdijk does not discuss Steiner as a contributor to the 20th-century 'ascetics of verticality'. If I'm not mistaken, Steiner is mentioned only once in passing. A drawing by Steiner also features in "Bubbles(Spheres Vol.1)", but apparently not discussed.
I wonder whether Sloterdijk has tackled Steiner's work more extensively elsewhere. Any help? Thank you! amb