Artworks that include references to the measured passage of time, such as images of clocks, watches, calendars, and solar and tidal patterns. While precise timekeeping came about largely due to inventions and schedules necessitated by the modern working environment, the importance of time is visible in much earlier artworks, such as the Très Riches Heures illuminated manuscript by the Limbourg Brothers, which included a page for each month of the year. In the 19th century, Eadweard Muybridge depicted motion over short time intervals in early photographic experiments, while Robin Rhode, in photographs and video works, displays a similar interest. Anxiety about the passage of time is palpable in Salvador Dalí’s surrealist masterpiece The Persistence of Memory, while the the relationship between time, love, and death is central to the works of Felix Gonzalez-Torres. Perhaps the most elaborate monument to timekeeping is Christian Marclay’s 24-hour-long video The Clock, which strings together borrowed film clips that reference specific times of the day.