About 11 years ago, after having written a tiny ray tracer from scratch using Java, I taught myself some ray tracing with POV-Ray. My goal was to learn a few POV-Ray features each day over 25 days and render some interesting scenes that exercise those features.

I began with simple spheres and cubes and gradually progressed to more intricate shapes and textures. Here are the results:

https://github.com/susam/pov25

The source code is in the "src/" directory. The rendered images are included in the README (scroll down to see them). I hope you like them!