And we're going to do it using the disk method, sometimes called the ring method. Actually, it's going to be more of the washer method to do this one right over here. So we're rotating around a vertical line. We want to use our disk or ring or washer method. And so it will be really helpful to have a bunch of rings stacked up in the y direction. So we're probably going to want to integrate with respect to y. Let me make it clear what I'm talking about.