Isosurface is an application and screensaver built around an implicit surface polygonizer... Don't let your eyes glaze over when reading "implicit surface polygonizer," or you'll miss out on some very cool eye candy! This OpenGL-based freeware provides a tool for exploring shapes and surfaces, and a screensaver for enjoying them in fullscreen mode. What's not clear yet is whether you can actually build new shapes... but even if not, I'll take the screensaver, please!