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The Bottom Side of a Sidewalk

I have another LaTeX entry all typed up, but figured I better keep my postings mildly entertaining so people don't give up on me. You probably have never noticed this, but every once in a while you will walk over little bits of glass (often purple in color) embedded in a sidewalk of a big city. I've seen this in San Francisco and Seattle. This picture is taken standing in an underground tunnel underneath the sidewalk, looking up. The plants are growing out of the sidewalk and UNDER the sidewalk...

Under a Sidewalk somewhere in Seattle, WA