Boxes can rotate

A fixed side view of rigid square cross-sections, not full three-dimensional cubes.

Click or tap inside the scene to drop one box above that spot. Its orientation is random, but its starting velocity and spin are zero. The dot marks a corner. Space or Enter drops a box in the middle.

Each square: 1 kg, side 0.35 m · gravity 9.81 m/s² · friction 0.6 · restitution 0.25 (no rebound below 1 m/s). No box-count cap; occupied spawn space is refused, never cleared silently.