[jellyksong]

There's an amazing game, 4D Toys [1], that lets you interactively play with 4D objects in a 3D environment. It's great on iPad.

I believe the developer had to create a custom physics engine to support 4D space [2].

[1] https://4dtoys.com/

[2] https://marctenbosch.com/news/2017/06/4d-toys-a-box-of-four-...