The video below shows the display being put through its paces, and when the clock rate ramps up, the rhythmic pulsations of the relays driving the seven-segment flip displays is hypnotizing.

But LEDs are far from the only way to run a seven-segment display — check out this mechanical seven-segment display for proof of that. We’ve been seeing a lot of mechanical seven-segment ...

seven-segment display (Image courtesy of LXD, Inc.) In their natural state, liquid crystals line up with the orientation "rubbed" into the front and rear glass panels. The rubbings are microscopic ...