Synthesis ping.
I have synaesthesia—I see music in color. Never knew I had it until I read about it as a teenager.
I'm sure you could DVR the episode on Ingenious Minds on the Science Channel.
Mr. Robison's website and book:
Synaesthesia has different manifestations. Letters and numbers only have the color of the ink or electrons they are printed with.
Movement, however, has sound, which is independent of any sound actually associated with it. For example, today I saw an ambulance with flashing lights but no siren. The red lights flashed with a distinctly different tone than the yellow lights. They sounded a lot like European sirens.
I wonder if a lot of composers have motion/sound synaethesia. That would explain how Beethoven was able to compose, even though he was deaf.
I have grapheme-color synesthesia. I see numbers and letters in color. Even in different alphabets.
About 1 in 2500 people have G-C synesthesia. It would be interesting to know how exactly this type of synesthesia developed, since it couldn’t have existed before writing was invented. Synesthesia exists in other forms (like associating taste with musical notes) which could have existed in pre-writing times, but most of its forms have to do with letters, so it must have developed after the advent of writing.
My brain hurts.