My daughter loves the flip sequin shirts that are all the rage for kids these days. Ekaggrat Singh Kalsi's daughter digs them too and she inspired his fantastic Sequino clock that "writes and rewrites" the time by flipping the sequins. Kalsi posted his build notes over at Hackaday.

Sequino: A Clock Which Rewrites Time Again and Again

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https://boingboing.net/2020/02/17/769145.html