Hypercube

Four dimensions do not fit on a screen. Hypercube flattens a tesseract twice — one perspective projection from 4D into 3D, a second from 3D onto the plane — and hands you the wireframe that survives. Drag it and it turns through all six planes of rotation available in four-space, three of them along an axis your eyes have never used. The cube inside a cube is not decoration; it is what depth looks like one dimension down.

JavaScript in the browser, with a Swift build for visionOS alongside; 2023.