A woman walks through an exhibition by American artist and filmmaker Laura Poitras, near the art work "Anarchist" by Laura Poitras in collaboration with Henrik Moltke, at the N.K.B. gallery in Berlin, Germany, on Friday, June 18, 2021. The exhibition by Poitras, known for her award-winning 2014 documentary on former U.S. intelligence contractor Edward Snowden, is on display at the gallery until Aug. 8, 2021. (AP Photo/Markus Schreiber)

A man stands in front of the artwork 'Hart Island", by Laura Poitras in collaboration with Sean Vegezzi, at an exhibition by American artist and filmmaker Laura Poitras, at the N.K.B. gallery in Berlin, Germany, on Friday, June 18, 2021. The exhibition by Poitras, known for her award-winning 2014 documentary on former U.S. intelligence contractor Edward Snowden, is on display at the gallery until Aug. 8, 2021. (AP Photo/Markus Schreiber)