Zhuangzi (say "jwahng-dzuh") and his friend Huizi (say "hway-dzuh") were walking on a dam over the Hao river when Zhuangzi said the little fish below were out enjoying themselves. Huizi, a logician by trade, objected: you're not a fish, so how do you know what fish enjoy? Zhuangzi turned it around: you're not me, so how do you know I don't know? Huizi took that and closed the trap: fine, I'm not you, so I don't fully know you, but you're certainly not a fish. Zhuangzi went back to the first question, how do you know, and answered it as if Huizi had asked where: I know it from here, over the river. In Chinese the same words can ask both, so it's partly a pun, and Huizi probably still wins on logic. But Zhuangzi had been watching the fish. You know a few things that way, from standing there: the dog is glad you're up, the kid liked her bath. This morning, notice one of them, and if a clever voice in your head says you can't really know that, let it win the argument and keep what you saw.