Story: Multiverse Magician

The boy magician heard about a type of magick called "Tesseract Magick," the point of which rested in the beleif of the Universe actually being a part of a Multi-verse (proven in physics today); an almost infinite number of parallell universes, similar, but not identical to the one we are in.
Rather than causing a change in your own Universe with magick, you use tesseract magick to transfer your awareness into a Universe where the change you desire has already occurred naturally. Intensely private and jelously guarded, the boy-magician finally gained access to this technique.
He was warned by his elder that once learned, the technique could be used ruthelessly by one's own subconscious, so that it was not uncommon to switch universes while dreaming, only to wake up in a new one. The main problem this causes has to do with the past things in similar universes. Sometimes books were never written or song lyrics change. It's easy to go crazy in a life where the past is changing and dynamic, static only to others.

As a man many years later he was still switching universes unintentionally, usually unnoticed by him. A driven traveller of parallel realities, at the mercy of his subconscious, never to rest in a place where the past stays the same again...