This is what I made for exam. It uses the consept of multiverse, doorway effect and how one have many choices that we all think of in some way. To some clear and some vague to the eye. We often think back on how thing would have been if we took another choice and where that would leave us in the present and the painting is a manifestation of that consept.The door in the middle is supposed to show how you have choosen one brance, aka going trough one door. The door can also be tought of as a mirror thus reflecting what is behind you and your current place in time.
Much more to it, but I leave it at that as I want the one seeing it to get some of their own interpretation.