Menger sponges are neat! I once wrote up some code to procedurally generate them for 3d rendering. https://github.com/nickdesaulniers/prims/blob/master/sponge.

Menger sponges are neat! I once wrote up some code to procedurally generate them for 3d rendering. https://github.com/nickdesaulniers/prims/blob/master/sponge.js https://github.com/nickdesaulniers/prims/blob/master/sponge.... (See readme for a rendering)