EVOLUTION IS MESSY, and all living things are morphs, riddled with vestigial parts and bolt-on exaptations from the general tool kit of rebuilding and redesigning. Structures built by a committee, never from scratch. And most of that committee is viral. D’Arcy Wentworth Thompson idealized the beauty of biological structures, in line with centuries of thinking about an ascendancy to Perfection. Actually, an ascendancy to a bigger, sometimes better, junk yard.