And it creates a shadow of the owl. So right now, the shadow is out here. And as the owl goes further and further down, the shadow is going to move to the left like that. And so given everything that we've set up right over here, the question is, at what rate is the shadow moving? So let's think about what we know and what we don't know. And to do that, let's set up some variables. So let me draw the same thing a little bit more geometrically.