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Uploaded on Dec 26, 2008
No chalkboard needed: dry ice with warm metal pressed against it. We automated the process with a gearmotor slowly turning a mixing bowl. The two bowls make great sounding boards (the noise was LOUD.) Hosted by the folks at http://www.911media.org/, http://www.dorkbot.org/dorkbotsea/ monthly tech/art/DIY meetings.