January 12, 2013 10:22 pm PST
Original Link: http://feeds.boingboing.net/~r/boingboing/iBag/~3/wfZWEf8aHJg/what-is-this-thing-mounted-on.html
What is this thing mounted on a San Francisco building?
We are having fun in the G+ Boing Boing community. Our friend Rob Walker posted this photo and said: I was in San Francisco recently and walking from Market/8th to the SF CalTrain station I kept noticing these odd little things, mounted about 10 feet off street level, a few-inches-wide tire-like object often (but not [...]Original Link: http://feeds.boingboing.net/~r/boingboing/iBag/~3/wfZWEf8aHJg/what-is-this-thing-mounted-on.html
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