It will become a disk. It will become a disk that looks something like that. And I'll just call the depth of the disk, so the disk, if you imagine a coin, this is kind of the side of the coin, the depth of the coin, the depth of the coin right over there. I know I can draw that better than that. Let me, so the depth of the coin is just like that. It's a fixed depth, and I'm going to call that dx, so it's just this distance right over here. It is dx.