I'm walking over ground of a gradually steepening pitch. At a certain point, I pause and start using my hands; the real mountain begins. I am climbing. Do I, as soon as my back slopes forward, return to the state of the quadruped? Almost: my body transforms; feet become hands and my two manual grips secure balance. Homo erectus, the standing man, of recent date, reverts back to the one from whom he is descended: the archaic quadrumane. This thunderbolt recollection became so black, in me, that I no longer fear to speak of the beast; I remember who we were (p.3).
Michel Serres (1999) Variations on the Body, Univocal.