These people have synesthesia — a neurological condition in which stimulation of one sense (e.g., taste) produces experiences in a totally different sense (e.g., sight). According to researcher Sean Day, approximately one in 27 people has some form of synesthesia.
my significant other has this. I am perfectly aware what colour is my name, what colour is connection between us spanning all across the eastern Europe and that broccoli is not green, but semi transparent shade of grayish-brown texture.
It is interesting but I do not live every day thinking only about that.