I believe our understandings - sensemaking - is ultimately based
upon physical systems but in the "compressed" format the brain
uses.
[1]
https://en.wikipedia.org/wiki/Where_Mathematics_Comes_From
covers some of the idea as it relates to mathematics for
example. As each metaphor lays upon each metaphor, the layers of
abstraction remove it from its sources because the brain is
capable of making connections that physical systems don't seem
to just yet. It allows us to imagine things-not-yet-possible (or
perhaps not at all) but their basis (going right back to when
we're babies) I believe stems from there and builds upon it.
Well yes, the physical systems / body activities that make the
initial connection from physical system/activity into a
simplified compressed 'brain' format. A lot of it is buried
right in our language. Grasping an idea. Grasping a ball with
your hands. Seems too simple, but it seems to be everywhere
References
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1.
https://l.facebook.com/l.php?u=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FWhere_Mathematics_Comes_From&h=kAQHltKmf