Sand has been used to keep track of the passage of time since antiquity. But using sand to make a persistence of vision digital clock (English translation) is something altogether new. And it’s pretty ...
"Sunagoyomi" (sand calendar), the world's largest sand clock, which measures the duration of a year, is seen at the Nima Sand Museum in Oda, Shimane Prefecture, on May 29, 2025. (Mainichi/Tatsuo ...
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