Did you know that if you manipulate a laser pointer fast enough, you’ll be able to see the image that the laser trail leaves behind? That means that with a little bit of mechanical ingenuity, you can have all the fun of a laser light show in your own home for the price of about $10.
This video from Yertly Vert shows you how to create your own mechanical laser show right inside of your house. Its pretty simple to be honest, everything is mechanical. All you really need is a laser, and a 3D printer to print the cogs (or someone who can print them for you).
Read more: http://www.popularmechanics.com/technology/gadgets/videos/a26961/create-your-own-mechanical-laser-show-at-home/