Synaesthesia is a confusion of the senses, whereby stimulation of one sense triggers stimulation in a completely different sensory modality. A synaesthete might claim to be able to hear colors, taste shapes, describe the color, shape, and flavor of someone's voice or music, the sound of which looks like 'shards of glass'. Throughout history, many notable artists and writers have claimed to suffer from synaesthesia, including, Arthur Rimbaud, Wassily Kandinsky, Vladimir Nabokov, and David Hockney. The condition remains as controversial now as when first brought to the public eye many years...