The mysterious "No Tech Zone" signs appearing around several San Francisco parks were placed there by a former Facebook employee turned artist.
The Guardian reports that Ivan Cash put the official-looking signs up last month, but they were taken down by the city. So this weekend, he and some artist friends were at it again.
The signs are meant to make people question the amount of time they spend staring at their gadgets instead of interacting with friends. Cash will also sell special edition versions of the signs for $100 apiece to recover costs.
Here's a video he made: