Looking at this Clock-a-doodle-doo is just like looking on a child playing with their own magnetic particle based white board.

clock-a-doodle-doo using its mechanical pen to pull the magnetic particle from the back layer to the from to show you the time. And on every minute changes, a full bar of block behind the display will ‘erase’ the drawing by pulling it back to the original state.
See Clock-a-doodle-doo clock in action:
“This unique electromechanical clock is like a cross between a Magna Doodle and an Etch-a-Sketch.”
– by TechnaBob
( Source: Technabob )
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