Look at what I made! I made this thing to project holograms. It looks like this: Pretty cool, huh? Just so you know, I used a neat little photography trick here in case that caused confusion. This little thing is super easy to make, so don't freak out about it. In case you didn't know, holograms are 3D images that change when you move to a different point of view. I'll show you how to make it in a short little book. Click here to see it. When I put this hologram projector on a phone/tablet and load up a special type of video, the hologram projects.