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I can think of it like the wheels are still there, the frame, engine, body etc but the design and materials have been completely refined and overhauled to be modern future tech today. The car even has new stuff like electronics and wifi. Meaning there are still base conceptual things there but they are not the same...knowing that reasoning by analogy is flawed but still satisfying to me to feel like I understand it enough.

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There's quite an interesting analogy there. I guess you could have a four wheeled wagon structure similar to wooden wagons of old, then an engine added and now electronics added, as an analogy to the triune brain. It's not that modern cars are built on wagon chassis but that the basic body with four wheels structure is similar for functional reasons. Probably similarly with the 'reptilian brain.' Our bits are maybe similar because they do the same job rather than because they evolved from that.

ya that's another way i would say it as well

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