Caption: when your program is a complete mess, but it does its job. A grid of four images: 1. A simple line drawing of a pigeon standing on the ground. 2. We see motion lines as the pigeon's head begins to rotate. 3. The pigeon has taken off into the air, lifted by its head spinning in a rotary fashion akin to a helicopter's blades 4. We see the pigeon from farther away, its head still spinning in a helicopter fashion as it soars away.