Apparently the developers at 1 Infinite Loop like to keep their code cheerful. An example posted to the Apple Developer Connection uses bunnies—yes, cute little bunnies—to demonstrate the power of frame buffer objects in OpenGL.
If you have a Mac, go ahead and download the example. Run it, then hit the Spacebar. You’ll see some very trippy effects that remind me of Dumbo’s pink elephant hallucination.
The frame buffer object, in case you were wondering, is a relatively new feature in OpenGL. It provides hardware-accelerated offscreen rendering of a texture. FBOs improve upon the older pixel buffer (PBuffer) technique, which was basically the same but required an evil context switch that hindered performance.