Charcoal drawings of South African choreographer Dada Masilo (1985-2024) and William Kentridge himself perform a fragmented pas de deux (dance for two) across the pages of a 19th century chemistry textbook. Tango for Page Turning was developed as one part of Refuse the Hour, Kentridge’s multimedia chamber opera investigating the standardization of global time in the 19th century and the clock’s subsequent relationship to processes of industrialization and colonialism. Here, the choreography’s stuttering cadence stems from Kentridge’s use of stop-motion animation, a process requiring significant labor and craftsmanship. As Kentridge and Masilo dance, they encounter poignant yet futile verbs—“undo,” “unsay,” “unremember,” “unhappen”—that evoke the tantalizing impossibility of changing the past.