Be sure to keep watching until the spotlights in the sky start flashing to the beat. It’s such a simple touch, but it transforms the animation from amazing to extraordinary. And it’s all packaged into a file size that’s under 4k.
The top commenter on explains it better:
the coding behind this is amazing. first, there are no textures stored in the executable, they are generated from an algorithm. also, some of the camera paths were then generated by using the bits of the procedural textures as the input for their coordinates. and even the shadows were faked, there was no light calculation done on them, it was just due to another brilliant technique of overlaying a less-detailed mesh over the terrain, which created pockets of shading.