I'm no artist. I couldn't draw a stick figure to save my life. But even I would be able to make a kick-arse sketch using this insanely cool, 2.7m tall, room-sized spirograph by artist Eske Rex. (It takes up 35sqm!)
As you can see from above, two stands are orientated at 90 degrees to one another over a giant canvas. Two arms extend from either stand, and where they meet is the real Van Gogh in this equation - a ballpoint pen. Weighs as much as 75kg are suspended from either stand to keep the momentum going. Whoever's the "artist" swings one of the pendulums - or if he's feeling crazy, both - and gets to sit back and relax while the physics-driven Drawingmachine does all the hard work. When it's done, you'll have a 2.7m by 2.7m image of ovals, circles, ellipses - basically anything but a square.
Rex has a background in carpentry, which explains quite a bit as to how he constructed such an interesting piece. Oddly enough, he'd never heard of a spirograph before inventing the Drawingmachine; rather, he was inspired by the harmonograph. [Eske Rex via Drawingmachine, The Atlantic]
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