If you have not previously visited, take a look at Nick Greeves' ChemTube3D, anever-expanding gallery of reactions and their mechanisms. The 3D is because all molecules are offered with X, Y and z coordinates. You also get arrow pushing‡in 3D. Here, I argue that we should adopt Einstein, and go to the space-time continuum!
Henry S. Rzepa (Fri,) studied this question.