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Description:

The spiral staircase, modeled after ribonucleic acid, or RNA, at the National Academy of Sciences Keck Center.

Alt text:
View from the top and down the center of a spiral staircase, made of concrete and glass.
Caption:
The spiral staircase, modeled after ribonucleic acid (RNA), at the National Academy of Sciences Keck Center. Photo by Avelino Maestas on flickr. License BY-NC-SA.
Credit:
Avelino Maestas on flickr
 View from the top and down the center of a spiral staircase, made of concrete and glass.