The Relativity theory, the copernican upheaval, or any great scientific convulsion, leaves a new landscape. There is a period of stunned dreariness; then people begin, antlike, the building of a new human world. They soon forget the last disturbance. But from these shocks they derive a slightly augmented vocabulary, a new blind spot in their vision, a few new blepharospasms or tics, and perhaps a revised method of computing time.