Some cuttlefish, and a few octopuses, go through an almost continual, kaleidoscopic process of color change that appears disconnected from anything going on outside them, and appears instead to be an inadvertent expression of the electrochemical tumult inside them. Once the color-making machinery on the skin is wired to the electrical network of the brain, all sorts of colors and patterns might be produced that are simply side effects of what is going on within.
