Check out how to create a unique Mechanical 7 Segment Display using cardboard! In this video, we unveil a one-of-a-kind mechanism that we've invented, featuring 7 circles each with its own trigger.

This article was taken from the November 2014 issue of WIRED magazine. Be the first to read WIRED's articles in print before they're posted online, and get your hands on loads of additional content by ...