[*] DRAINSPOTTING
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License Some Rights Reserved Attribution
Photographer Flickr Import Bot
Description Only in San Francisco
by ojbyrne (Owen Byrne)
Imported from Flickr (view original).

See en.wikipedia.org/wiki/Manhole_cover for why I found these interesting. Particularly the part about Reuleaux triangles

Tags: Manhole covers, San Francisco
Uploaded 2006-09-22 01:34:13
Photo Number 2662
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