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The parlor walls. All that stuff is still circulating in our brains even though we don't know the reference. Those books played tricks on us and now we can't get rid of them.

{Logic exists in the mind. science is only in your mind too, it's just that that doesn't make it bad. or ghosts either."
Laws of nature are human inventions, like ghosts. Law of logic, of mathematics are also human inventions, like ghosts."
...we see what we see because these ghosts show it to us}

Robert M. Pirsig