1. A graphical user interface device for comparing body images, the interface comprising: a display coupled to a microprocessing device and a memory device; an electronic representation of a first body image taken at t 1 along a first plane and a second body image taken at t 2 along the first plane, wherein the electronic representations are stored in the memory device and displayed on the display; and an electronic representation of at least one composite image of the first body image and the second body image.