Synesthesia - A condition in which one type of stimulation evokes the sensation of another, as when the hearing of a sound produces the visualization of a color.

Some people naturally experience this their whole lives. Also it has ocurred while some people are under the influence of various hallucinogenic substances. I was curious to find out if anyone here has ever experienced it in a dream or in real life. Personally I think it would be amazing to be able to see a color when a sound is heard. Imagine listening to a symphony perform and seeing colors corresponding to the different blend of sounds.