Synaesthetic

Liz said that her name looks yellow, so I assume she’s synaesthetic.

One of the most common synaesthetic effects is to perceive each letter as having a colour.

Wherever he was, whatever he was doing, he found himself suddenly accosted by some kind of synaesthetic fixation with the woman: hearing the colour of her hair in the mosque, smelling the touch of her hand on the tube, tasting her smile while innocently walking the streets.