The color of sound (and other ramblings)...

Synesthesia...I've always been fascinated by synesthesia, a condition that causes people to experience sensation in one sense when another sense is stimulated (i.e. equating a C major chord with the color yellow). In the late 1800s, spurred by Freud and a fascination with the subconscious, many musicians were obsessed by the concept of synesthesia. It pops up a great deal in my thesis research.