http://portablerockart.com
This prehistoric figure stone was discovered by Dennis Boggs of Irrigon, Oregon, and interpreted by Ken Johnston, Hebron, Ohio, portablerockart.com, as a "joke stone" or "laughing rock." It is a combined mouth/head, like a Pac-Man figure, depicting a tongue on the roof of the mouth as if laughing. The stone has a circular designed base which balances it perfectly to store and release kinetic energy by moving for 25 seconds after being touched. It is standing on a smooth porcelain surface for the video..
http://portablerockart.com
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