Holography without lasers: hand-drawn holograms (amasci.com)

That's way cool. I should try this.

The other material on this site is also worth a look.

A cool weekend project would be to come up with software that takes an image and projects it like this so it could be cnc'd on a lexan board.

I did this many many years ago with some old CD-cases that I had given a light coating of black spray paint on the inside. It takes a while but works like a charm.

Anyone who isn't familiar with amasci should know that it's an absolute treasure trove of information. Go to the "bad physics" page and you're guaranteed to spend days there reading:

http://www.amasci.com/miscon/miscon4.html

http://amasci.com/miscon/elect.html

Nothing ever made me feel better about not understanding certain concepts than this site.

This is the type of thing patents were invented for!

This is amazing. Blows my mind how he can have the patients to do that. I mean i can spend hours coding, but i dont think i could scratch plexiglass for hours. very cool thou!