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Message: <blockquote data-quote="pemerton" data-source="post: 8239396" data-attributes="member: 42582">I think one difference is that if you're not sure how high your house wall is you can measure it. But you can't measure the height of the wall you're imaging. When you imagine the measuring tape hanging down the length of the imaginary wall you have to further imagine what number it shows. There is no objective standard of correctness.This is also relevant to your remark upthread about a "thought experiment". Thought experiments in mathematics and physics have objective standards of correctness, because they are worked out applying mathematical rules.RPGing doesn't look like this except in some corner-case instances such as correlating distances, movement rates and time passed.</blockquote>