Gama-Go's Greg Long just snapped this photo of a roll-up door in San Francisco. Click the image to see it larger. Here's what's written on the door above and below the graffiti:
All are welcome to express themselves in the box below.
Printing within the above box is hereby expressly permitted and shall not be considered "graffiti" in accordance with article #23 of the San Francico Municipal Code.
David Pescovitz is Boing Boing's co-editor/managing partner. He's also a research director at Institute for the Future. On Instagram, he's @pesco.