Trevor Paglen review: turning the NSA's data combing into high-concept art

Altman Siegel gallery, San Francisco
The artist, who contributed to Citizenfour, makes the unseen surveillance systems overlooking our lives visible – and sometimes beautifulThe insidious enormity of the information age, our data-driven, privacy-compromised culture, is perhaps the most difficult of subjects for art. It requires an uncommon combination of tech-savviness, aesthetic sophistication and humanistic activism – attributes that, thankfully, exist in the work of the American artist Tr