Couple years back, I had my attempt (I like to call it Poor Man’s attempt btw) at making a simple laser projector. Well, I’ve seen better ones including this lego laser projector that uses diffraction grating to literally shoot laser beams into abysmal pit of awesomeness!
You will have to watch the video to understand the awesomeness in the lego laser project:
WARNING: Don’t try this home at folks, if the laser gets in your eye, you can become BLIND! Make sure you know what you are doing.