You have something called epigenetics. Epigenetics are things that change in the DNA of the organism after their sexual or asexual reproduction has taken place. In certain varieties of corn, and the fur of dogs for instance, epigenetics creates a unique pattern. It is believed to be the cause of different personalities even in twins.
[https://www.google.com/search?client=ubuntu&channel=fs&q=epigenetics+in+the+brain&ie=utf-8&oe=utf-8](https://www.google.com/search?client=ubuntu&channel=fs&q=epigenetics+in+the+brain&ie=utf-8&oe=utf-8)
Basically, in true ELI5 fashion, your brain literally mixes up the rubiks cube of parts of your DNA in order to create as random of a thought process as possible, as some form of selection in our evolutionary history selected for this. It likely partially lead to us thinking out of the box.
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