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How should photographers challenge their audience and how has the practice of photography progressed in the last several decades? One of those agents of change – artist Barbara Crane – discussed the topic with Think host Krys Boyd during Friday’s episode. Her groundbreaking work from the last 25 years can be seen in “Barbara Crane: Challenging Vision,” which is on exhibit at the Amon Carter Museum through May 10. Think airs Friday at 7:30 p.m. on KERA (Channel 13). It airs again Wednesday at 1:30 a.m.