Spiral Stairs at San Francisco's Embarcadero Center

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I've been fascinated by the oft-photographed spiral staircases in San Francisco's Embarcadero Center for years. I finally got the opportunity to photograph them myself during my recent visit to the City by the Bay.

I thought this image would make a good candidate for the Droste effect. Below is a sample:

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I'll most likely be doing some further experimentation!