I’ve known a few people in my time who have claimed to “hear light and see sound,” and the like. The term often used to describe that is “synesthesia,” though naturally there’s a lot of debate about the phenomenon. Personally I’ve never given it much thought beyond “I wonder what that would be like?”
Well this morning while I was still in bed, it turns out that I was sick enough that when the bedroom door was opened, the modest amount of light coming in triggered a crashing sound like cymbals in my ears, which in turn triggered a series of geometric patterns behind my eyes reminiscent of test patterns or certain old style screen savers.
So now I know.
(I am also doing my best to take it easy today.)