clipped from www.ohgizmo.com

By Andrew Liszewski

The cards are made from simple foam-core but also feature a set of neodymium magnets on the bottom that stick to metal screws around the base. This ensures the cards are always put back in the exact same position, compensating for any small errors as they’re moved around.

It’s a clever idea and all, except for the fact that it takes the arm almost 50 seconds to change the display from 12:09 to 12:10 in the video below. I imagine if the setup incorporated a more advanced/considerably faster arm the clock would be more practical, though I assume you could also compensate for how long it takes to move around when it comes to calculating what time it should display. But as it stands now, it’s not the kind of thing you’d want to rely on in the morning if you’re always late for work.

[ Stonehenge - A Robotic Digital Clock ]