Hi Tom,
I like the idea but the only thing that comes to mind is how the groove optics destructively interfere with eachother to where they are not reflecting light anymore, and a background will add an entire field of optics over the hologram surface and interfere with the foreground object. I will play with the idea and see if I can come up with something after I finish launching the new Deftware store website over the coming few weeks and releasing the first beta release of PixelCNC.
Thanks for the feedback! :)
- Charlie