It's an interactive Bézier Curves engine. Drag the dots around the project window to interact with the curves system. Bézier curves are honestly really cool in my opinion, and they're kinda hard to explain, but basically there are three points. A curve is drawn between 2 of those points, and the 3rd point is the control point that the curve trends to. See inside if you want the formula for them. Just so you know, Bézier is pronounced "beh-zee-ay"