Their instantiations are based on either some physical hardwiring (instincts) or cultivated though observations. If an idea has the appearance of being eternal, it's because either there's a process in place for that physical structure to be replicated though time, or because new minds are making essentially the same observations.
I suspect even some of the most "eternal" of ideas are less so than you might think. If we were capable of communicating with a human from 100,000 years ago, in detail, how many identical ideas would we share? I think it would be very few, given that many people's ideas already differ subtlety even when they live in similar environments.
If you crushed all the atoms in the universe into dust, would the number 2 also be destroyed in the process? I don't know if the mathematical idea of 2 exists in the physical world at all. I don’t know if that’s even a well formed question.
Obviously humans perceive 2-ness. And if you crushed all our minds to dust, nobody would remember 2. But would that really destroy the number? If an alien civilisation in another universe counted things, I think it might be the very same number 2 that they use to count.
Numbers show up in a lot of different cultures. If we all independently reinvented / rediscovered the same thing, that’s interesting - don’t you think?
Does convergent evolution prove that a structure like an eyeball exists in some abstract realm, or does it mean there's a process which - given a similar environment - will produce that structure over time?
It's not hard to see why the same useful inventions emerged in similar environments.
Their instantiations are based on either some physical hardwiring (instincts) or cultivated though observations. If an idea has the appearance of being eternal, it's because either there's a process in place for that physical structure to be replicated though time, or because new minds are making essentially the same observations.
I suspect even some of the most "eternal" of ideas are less so than you might think. If we were capable of communicating with a human from 100,000 years ago, in detail, how many identical ideas would we share? I think it would be very few, given that many people's ideas already differ subtlety even when they live in similar environments.