Building The World’s Smallest RGB LED Cube
 

What’s the smallest RGB LED cube? A 1x1x1 cube is easy, but it’s a stupid joke and we’ve heard it before. No, to build the smallest LED cube, you’ll have to stuff 64 RGB LEDs into a cubic inch, like [Hari] did with his miniscule LED cube.

http://hackaday.com/2016/02/05/build...-rgb-led-cube/