Diffraction Projector Laser Show

In this project we are gonna build a laser show using diffraction and lasers.

Step 1 Get the Materials

you are going to need a linear diffraction grating (can be bought online), a short PVC pipe or cardboard toilet paper roll, a powerful laser (not a cheap $1 one), a wire clothes hanger (or any other thing that can hold the tube while it spins), pliers, a programmable lego motor set or slow-turning motor, a cup, a fog machine and tape.