I would have through the he would have done a projection from 4d space to 2d space similar to how 3d graphics does a projection from 3d to 2d. Similar to http

I would have through the he would have done a projection from 4d space to 2d space similar to how 3d graphics does a projection from 3d to 2d. Similar to http://christopheremoore.net/4d-renderer/ http://christopheremoore.net/4d-renderer/ It I guess in that case it would be difficult to interact with it in VR. I guess this slicing technique works but it would be a bit weird.