So we could say its depth right over here is DY, DY. And we could draw other cross sections. For example, right over here, our Y is much lower. It might look some, so our height will be like that. But then our base is the corresponding X value that sits on the curve right over that XY pair that would sit on that curve. And so this cross section would look like this. And once again, if we wanted to put, if we wanted to calculate its volume, we could say there's an infinitesimal volume and it would have depth DY.