As I left Old World Wisconsin yesterday (a 500 acre museum dedicated to the history of Wisconsin and containing some of the oldest and most historical buildings in WI. ) I saw this unique object. Upon looking at it closer and operating it, I found out that not all doors have to have spring loaded hinges to shut themselves. This rock is situated towards the middle of the chain and when you let go of the door, gravity takes care of the rest! So, the rock on a chain is not decoration. It is a gravity operated door spring :)
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