“Screen Time is a community clock connecting strangers through their mobile backgrounds. Participants are invited to take part by making a screenshot of their mobile device lock screen and submitting it to the allocated time slot. The submitted images are then compiled and presented, each being displayed for the single minute at which they were taken. The outcome is a clock that each minute reveals a glimpse into someone else’s life.”

http://www.helmutsmits.nl/work/screen-time
http://screentimeclock.net

And other works on sorting, time and measurement:
Self Carrier Shelf
All the times
Measuring in Years
Precautionary Measures
23 Holes