6/365: Newtonian Demonstrator
Newtonian Demonstrator or Newton’s Cradle.
A homemade Science project that’s why the balls (in this case, marbles) are not evenly hanged 
Update: This has been re-done because the thread managed to get tangled upon transport and because the marbles didn’t click as expected due to the plastic thing around it. 
This is also know as executive ball clicker or balance balls.
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