Imagine a two dimensional universe, a plane. We take two perfect circles on this plane; they are uncompressable, being elementary particles or some such thing (whatever they are, the important thing is that they cannot be compressed). We take these two circles and set them on a collision course (the line defining the course passes through both of the circle's centers). What happens when they collide? They can't refract because the angle is straight-on. They can't bounce because they can't be compressed. The energy has to go somewhere; so what happens? They could explode, perhaps. Maybe the entire two dimensional universe is destroyed somehow? Or maybe the energy gets transferred in another direction, off of their twodimensional plane? While they are perfect circles ON the plane, they may not be spheres in 3d space- so perhaps one goes "up" and one goes "down" and they eventually end up in a different plane (universe) than when they started? If the latter is the case, perhaps we could replicate this with three-dimensional spheres? Any thoughts?