Also like the video at the Exploratorium where you're watching a guy sweep the floor from above. After a while you realize the debris is swept into the shape of clock hands, and he pushes it around with the broom to keep time.
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It reminds me of the group that built a wooden digital clock in real time. Sadly their website is dead, but there are some remnants on YouTube https://youtu.be/RPbm_uEiwRY and press reports like http://designtaxi.com/news/352376/Watch-Time-Being-Mesmerizingly-Built-By-Workers-In-Real-Time/
Also like the video at the Exploratorium where you're watching a guy sweep the floor from above. After a while you realize the debris is swept into the shape of clock hands, and he pushes it around with the broom to keep time.