I worked at a dance audition recently. (Not dancing, of course — I handed out numbers, signed people up, handed out paperwork, and moved them in herds from room to room. All of the scutwork that makes things smoother for the casting directors.) I’m always amazed how quickly and well the choreographer can teach a set of moves, using a ton of words I don’t recognize. And I’m also amazed at how fast the dancers can pick up and memorize an entire routine.