also true for complex perceptions of motion. So, here we have -- let's turn this around -- a diamond. And what I'm going to do is, I'm going to hold it here, 00:08:53 and I'm going to spin it. And for all of you, you'll see it probably spinning this direction. Now I want you to keep looking at it. Move your eyes around, blink, maybe close one eye. And suddenly it will flip, and start spinning the opposite direction. Yes? Raise your hand if you got that. Yes? Keep blinking. Every time you blink, it will switch. So I can ask you, which direction is it rotating? 00:09:20 How do you know? Your brain doesn't know, because both are equally likely. So depending on where it looks, it flips between the two possibilities