Evelyn Underhill writes in Mysticism, “William James once suggested as a useful exercise for young idealists, a consideration of the changes which would be worked in our ordinary world if the various branches of our receiving instruments exchanged duties; if, for instance, we heard all colors and saw all sounds.”
I tried it with colors first, on book jackets and book marks. They looked like they were trying to cooperate.
I stared for a long time. The sound didn’t come at me as on Bose speakers, but the colors vibrated. Then I saw a robin.
In the car, where I listen to most of my music on Bose, I put on classical and realized I had seen color all along. Then I heard a robin.