Synesthesia is a very interesting occurrence. There are some people that claim peyote and mild hallucinogens can give you something of this effect, and I have experienced it mildy when drifting off to sleep. Sometimes when fading into unconsciousness, and listening to music, I will see colors and shapes that go along with the sound. It's a fairly common thing, and many people don't realize that the sense of smell is connected to synesthesia very closely. Also, on the topic of savants, I watched a program about a child who was autistic, but could play the piano perfectly. His brain could not handle everyday activity, but he could play a piece by Mozart the way it would've sounded if Bach wrote it, and many other things. Incredible.