In the perception of the perceiver

Mental Health

Once there was a universe that not only revolved around, but was also contained in and formed from, the mind of a single being named George. George did not know that he was his own universe in its entirety, because he made no efforts to investigate the matter; he assumed that this was the case even as he interacted with his own mental projections of characters who, for all he knew, might have been real individuals with free will and their own rich inner lives. 

George was a lazy jerk, and The Elder Council of the Metaverse passed unanimous judgment that the best thing to do would be to leave George there, totally alone, for whatever duration his existence ended up having. He wouldn't mind, and it would be far better for the other beings of the vast multitude of universes to never have to meet him.