If you’re one of the surprisingly large number of Americans who follow the Tour de France every summer, you may have noticed massive, gorgeous printed messages on the route roads, reports Fast Company.

Nope, they’re not paint–they’re made of chalk, and they’re sprayed on the road surface by ChalkBot, a massive trailer-mounted inkjet printer sponsored by Nike and the Livestrong foundation. Check out how ChalkBot works.

Originally posted by Rich Whittle on February 19, 2014 in Ideas.

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