Drawing Perfect Circles...

...and stabbing you in the hand every time you reach into your art box. It's the classic compass, the old school way of drawing arcs and circles, and measuring distances on a map. It's always fascinated me that two such completely different activities can be accomplished with the same device. It's like your toaster also having the ability to print photos. Builder bricks.life.idea shows us how it's done in LEGO, so not only does it do those tasks, it can be reconfigured into a effectively endless array of other things too, mind blowing.