←→↑↓ ... change camera angle Space ... toggle play/pause 'H'/'L' ... zoom out / zoom in 'J'/'K' ... approach the camera / pull the camera 'D' ... toggle dark mode 'M' ... change model '1','2','3','4' ... change nesting level 'A' ... toggle visible axis
https://en.wikipedia.org/wiki/Hilbert_curve
