It was the 5th dimension.it was good , the only thing that was strange to me was when he went into the black hole . I don't know , that scene just didn't feel right
I know , but it didn't seem right to me , not that I have any knowledge of what a 5th dimension would be like but i'm just saying... the part at the end where he through the hole through time I have no problem with but the bookshelf was just weird to meIt was the 5th dimension.