We like to think that we are finely evolved creatures, in suit-and-tie or pantyhose-and-chemise, who live many millennia and mental detours away from the cave, but that’s not something our bodies are convinced of. We may have the luxury of being at the top of the food chain, but our adrenaline still rushes when we encounter real or imaginary predators. We even restage that primal fright by going to monster movies. We still stake out or mark our territories, though sometimes now it is with the sound of radios. We still jockey for position and power. We still create works of art to enhance our senses and add even more sensations to the brimming world, so that we can utterly luxuriate in the spectacles of life. We still ache fiercely with love, lust, loyalty, and passion. And we still perceive the world, in all its gushing beauty and terror, right on our pulses. There is no other way. To begin to understand the gorgeous fever that is consciousness, we must try to understand the senses—how they evolved, how they can be extended, what their limits are, to which ones we have attached taboos, and what they can teach us about the ravishing world we have the privilege to inhabit.