Det är inte utan att man studsar till när man läser Maurice Merleau-Pontys bok Phenomenology of Perception och man helt plötsligt kommer över dessa ord:

"For the subject does not say only that he has the sensation both of a sound and a colour: it is the sound itself that he sees where colours are formed. [...] Synaesthetic perception is the rule, and we are unaware of it only because we have unlearned how to see, hear, and generally, feel, in order to deduce, from our bodily organization and the world as the physicist conceives it, what we are to see, hear and feel."