Ah, I guess you looked them up? The best example of them is a video on youtube by wbeaty (of amasci.com fame). Everything the man says should be taken with a grain of salt, but he often has some interesting insights, useful ideas, and his list of "things that are wrong in textbooks" is great. There's quite a few more videos of them on youtube than there were when I first heard of them, but wbeaty's is still the best (and most complex) example of them. At the end he shows off an (I think) acid-etched copper plate with various test holograms on it.
Also, now I'm thinking it'd be neat to be able to have a CAD program in which you could custom-design the layers for a part.Print a sphere from concentric layers, stuff like that.
Also, now I'm thinking it'd be neat to be able to have a CAD program in which you could custom-design the layers for a part.Print a sphere from concentric layers, stuff like that.