See the creative processes of artists Nathalie Djurberg & Hans Berg, Olafur Eliasson, Hiwa K, and Susan Philipsz in “Berlin”—the second of three new episodes from Season 9 of the “Art in the Twenty-First Century” series. Season 9 premieres with back-to-back new episodes—”Johannesburg” and “Berlin”—on Friday, September 21, 2018 at 10 and 11 p.m.