If we knew how to create world simulation, and how to make it working 4D, then humans would be able to plug themselves in, and experience 4D space. Alternatively there could simulated 4D beings, whose sentience could be transferred to robot body in our real 3D space.
Yep and there already is a game that does it. It called 4D Golf and you ca n play it also I’m VR. On the YouTube channel codeparade are a lot of interesting dev logs.