
I spent the early evening in San Francisco last night attending an AIA (American Institute of Architects) event and found myself with a few free minutes to walk around my old stomping grounds between the financial district and Union Square. So I popped out my iPhone and took a few signage pics, as I am wont to do. Now how did my iPhone know it created a before and after set of my point of view when visiting this particular establishment in times past?
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