Something not in the original http://amasci.com/holo/ http://amasci.com/holo/ site is the discovery that if you scratch complete circles rather than arcs, then

Something not in the original http://amasci.com/holo/ http://amasci.com/holo/ site is the discovery that if you scratch complete circles rather than arcs, then rotate the whole plate under the light, the hologram rotates around an axis normal to the plate. https://www.youtube.com/watch?v=UtmGgmhWBAc https://www.youtube.com/watch?v=UtmGgmhWBAc