Christian Marclay's installation The Clock is a montage made up of hundreds of film clips from scenes that have clocks or watches in them. The piece is 24 hours long and edited together so that every clock you see on screen shows the actual time.
Watching it for any amount of time is hypnotic and strangely addictive. The fact that it is never ending (unless you go to one of the special 24 hour screenings and watch it all!) means you can fully immerse yourself and, bizarrely, given that it makes you so hyper-aware of time passing, it causes you to relax and not worry about time.
The Clock is showing at Tate Modern until 20th January 2019.