This is a binary clock that was built into a 3d-printed case created in Minecraft. It is powered by an Arduino UNO and shows the current time in a binary coded decimal format.

The model was exported with the free tool Mineways and printed on a Zprinter 650 3d-printer, with a block size of 125mm^3 (so every block has an edge length of 5mm). After printing, LEDs were glued into the case after filing the openings a bit wider. Then, the LEDs were soldered to form a 4x4 LED matrix, and the matrix was connected to an Arduino board.

A description of the setup can be found here: http://postapocalypticresearchinstitute.wordpress.com/2012/07/18/diy-minecraft-binary-clock/

Arduino code and circuit-description can be found here: https://bitbucket.org/boden/arduino-based-binary-clock-on-a-4x4-led-matrix/overview

More images of the clock can be found here: http://imgur.com/a/Nc5Rk