So right now, this is going down at 20 feet per second. Now, what we're curious about is we have the light over here. Light is coming from the street lamp in every direction. 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?