QUOTE : The tinkering of evolution can concoct perceptual interfaces with endless forms most beautiful and most wonderful; the vast majority of these, however, are to us most inconceivable. Evolution is not finished tinkering with the perceptual interfaces of Homo sapiens. The mutations that bless one in twenty-five with some form of synesthesia are surely part of the process, and some of these mutations might catch on; much of the tinkering centers on our perceptions of color. Evolution defies our silly stricture that our perceptions must be veridical. It freely explores endless forms of sensory interfaces, hitting now and then on novel ways to shepherd our endless foraging for fitness.