Gabriella Mangano and Silvana Mangano are identical twins. This is not at all incidental to the hypnotic charisma of their videos, which have in the past often been documentations of joint actions. Among these is if . . . so . . . then, 2006, in which the artists, seated face-to-face, reach past each other and draw in unison. Their sheer physical similarity, calligraphic gestures, and muteness—plus the simple documentary cinematography—produce the overwhelming sense of a single artist doubled. Many of these videos were filmed in austere black and white. Indoors or outdoors, against