If you've seen "Star Wars," chances are you've seen the futuristic hologram projectors ... through a 3D scanner, which reflects and focuses the laser onto an exact place in the air above.

An curved arrow pointing right. It's really simple to build a projector for your smartphone to be able to project the same types of holograms seen in Star Wars and other movies. Here's how!

An curved arrow pointing right. It's really simple to build a projector for your smartphone to be able to project the same types of holograms seen in Star Wars and other movies. Here's how!