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I don't want to get too far off topic, but there is a building in Springfield, Ohio that was built in the '20s or 30's as a skating rink. The floor is as above, only it is thousands of concentric circles. I don't know the details of how it was constructed, but was used as a machine shop for a while because the floor was so solid. The last time I was in it, it was a warehouse - with the most beautiful floor imaginable.
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