“Since so much of today’s counterterrorism war is cloaked in secrecy, Clark faced a challenge in creating works about the goings-on at military prisons like the one at Guantánamo Bay and the CIA’s now-shuttered “black sites†for interrogations or “extraordinary renditions†— not to mention the detention centers hosted by foreign countries. At times, he arrived at some rather conceptual ways to present the few visuals available.”