This thing is a Phenakistascope.

It’s a REALLY old animation toy. It’s sort of like a zoetrope, but instead of a drum it has disks. You still look through slits to see the action. When they moved, they looked like this:

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I bring this up because this thing is where I got Phena’s name. You’re welcome for the history lesson that wasn’t much of one. Carry on.