Synesthesia: A Perceptual Experience

The composer Scriabin was really interested in the effects of putting sound and color together. Not everyone who does this sort of thing is actually a synesthete. How can you tell if someone really is synesthetic? The method has everything to do with internal consistency. If I were to ask you to make up some colors right now, and then I ask you again a year from now, if you're not synesthetic, it'll be the same colors.