Here an amazing project. It’s a 3D projector “homemade” with Arduino. Many Arduinos and lot of LEDs RGB.

We build a LED cube with 4096 LEDs powered by 16 arduinos. It can show 3D animations, words, and just about anything else we want. It stands about 6 feet tall including the base and has over a mile of wire connecting it all together.

The full build log and images are hosted on the [website]. Thanks [tbennett] for submitting it