A 4D hypercube (tesseract) with 16 vertices at (±1,±1,±1,±1) is rotated in two independent 4D planes, then its 4th coordinate (w) is scaled down and perspective-projected into the 3D scene you can orbit. At full collapse the tesseract degenerates into an ordinary cube.
💡 This is the real construction used to draw a tesseract: 4D rotation matrices (XW, YW planes) followed by perspective division by (d − w). Setting the collapse slider to 100% forces w → 0 for every vertex — the 4-dimensional object literally becomes a 3-dimensional cube, which is what "dimensional collapse" means mathematically.
Drag to orbit · Wheel to zoom · Watch the 4th dimension flatten