Trace comprises 175 abstracted portraits of prisoners both past and present, rendered with 1.2 million Legos. The colorful medium is a direct, stark contrast to the subject.  Photo 1 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 Exhibition

1 of 7

Trace comprises 175 abstracted portraits of prisoners both past and present, rendered with 1.2 million Legos. The colorful medium is a direct, stark contrast to the subject.