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the brain is like a tree

I think that the brain is like a scientist; however, it only works if you look at the most perfect scientist (and the most perfect brain, I guess). In relation the brain's ability to make stuff up, there is no bias. The brain does not tell its owner that it is filling something in or covering something up or that the monster in the dream is not real, it just does it, accepts it, and moves on. The scientist knows that he or she must retest and change a variable. So the brain is like a scientist, but it fools itself into refusing to retest.