BlodySlam.net

: Provides instructions for building a plastic projector and includes videos optimized for the 3D effect.

HoloBall is a bit different. It is designed to wirelessly transfer pictures, videos, and other files from your phone to a projection device for a larger display. It's a great tool for presentations or streaming content to a separate projector screen.

The app is useless without the physical pyramid. Fortunately, you can build one for pennies using old CD cases or transparency sheets.