This is a binary clock that was built into a 3d-printed case created in Minecraft. It shows the current time in a binary coded decimal format. The code and idea are based on a tutorial by Daniel Andrade.
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 4×4 LED matrix, and the matrix was connected to an Arduino board. Two pushbuttons were added for setting the clock (hours and minutes).
More images can be found here: http://imgur.com/a/Nc5Rk.
The code and case can be downloaded here: https://bitbucket.org/boden/arduino-based-binary-clock-on-a-4×4-led-matrix/overview, and here: http://www.thingiverse.com/thing:28831.