It’s taken me some days to write about Theresa Hak Kyung Cha’s show at Artists Space, because I didn’t want to face the fact that she’s no longer around to keep growing as an artist, a thinker, and a woman. Cha explored her deep interest in language among distinct cultures—including that of her native South Korea, where she grew up, and of the United States, where she moved, in 1962, when she was eleven—with video, performance, and multimedia installations.