Imagine that, by some puckish magic, overnight you gained all the strength and skill of a professional acrobat. Yesterday, you’d trip walking down the street; today, you can skip across a tightrope. All your friends are bewildered at your transformation. You’re bewildered, too, most of all because you no longer know your body, how fast you can run, how much you can lift, how high you can jump. This is what it is to be a kitten. Every day our kitten performs all kinds of preposterous stunts—leaping over the other cat in mid stride, using a wooden drying rack as a jungle gym—simply because she doesn’t know that she can’t.