Refraction can only be viewed via the gun gallery, where armed guards once patrolled. The sculpture, made up of Tibetan solar panels, seems poised to fly, yet too heavy and constrained to do so.  Photo 4 of 7 in A Behind-the-Scenes Look at Ai Weiwei's Sobering Alcatraz Exhibition

A Behind-the-Scenes Look at Ai Weiwei's Sobering Alcatraz Exhibition4/7

Refraction can only be viewed via the gun gallery, where armed guards once patrolled. The sculpture, made up of Tibetan solar panels, seems poised to fly, yet too heavy and constrained to do so.

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