Originally posted by Mannie Phresh
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It requires two people and flatland or what is believed to be flatland. one guys stands the other guys walks straight forward. if the world was flat the person walking forward, all of his body should be viewable no matter the distance. However, on a round world, someone walking forward will slowly start disappearing from legs up. Therefore, the world is round. The same experiment can be done with boats, water is supposed to be flat; however it is not. The boat will disappear slowly before the mast of the boat.
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