Recently came across this video by Adam Savage:
It’s pretty fascinating that once upon a time handheld games were a bit more advanced than whatever Tiger Electronics was selling.
Fully mechanical at that.
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It looks incredibly smooth, how many frames is it running at? 
This kind of mechanical games have always fascinated me, the “Arcade Games”, I was able to meet some of them, even the witch with the magic ball.
But, what left me with my mouth open was the 3D scanner. 