Found a cool count down the seconds devices.

https://hackaday.com/2022/10/26/digital-hourglass-counts-down-the-seconds/

The idea is really cool.

https://twitter.com/BitBlt_Korry/status/1583781819539152898

There are 4 linear actuators called solenoids are mounted on the back. By pushing and pulling a sheet magnet attached to the tip, a magnetic field of any digital shape can be created.

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