The idea is to cut a pattern on 5 of the 6 sides of a cube. Then when you turn on the LED, in the cube, the light shines out through the shapes that you cut. You can either use their pattern or your own patterns.
The measurement on this pattern is in metric.
This lamp was inspired by a cube from a video game (minecraft).
These pattern is hosted on Dropbox. You will need to create an account with them to download the pattern.