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One of the questions regarding the PGF is how was it that Patty could leave a deeper impression in the sandbar than Roger's and Bob's horses. There was well-known poster here on BFF who did an experiment on a sandy beach and posted his results (and video or pictures I think). It turned out that his foot impression was deeper than a horse whose rider had it walk near his tracks. I was flummoxed how a heavy horse on small hooves would not be deeper that a much lighter person with larger feet. The moral of that story is that the mechanics of a foot's movement are far more important than the weight of the person/animal making the impression. I wish I could remember the BBF poster's name but cannot. It was a while ago.