polymorphous [pol-ee-mawr-fuhs], adj 1 having, assuming or passing through many or various forms, states, or the like.
Multiple exposure images are by their nature polymorphous -- the reality in front of the lens passes through many forms and stages before they are complete. The images here are all multiple exposures created either solely in camera, in post-processing or by a combination of both. Layering image upon image transforms reality and turns the construct of photography, i.e., to capture reality, on it's head. For these images I believe the whole is greater than the sum of the parts. To quote Aaron Siskin "When I make a photograph I want it to be an altogether new object, complete and self-contained."