Download the Hypercube demo (HTC Vive required to run it)
One one of the two controllers works. You need to get both controllers to register and figure out which one it is.
- Pressing down on the touchpad changes between different 4d objects
- Grip and drag translates the object
- Trigger and drag while outside the sphere rotates in 3d
- Trigger and drag while inside the sphere rotates in 4d
Lastly, here's the Reddit post where there's some additional discussion.