I went to a lecture by Alice Roberts about the identity of "the celts" and it contained a number of themes relevant to this discussion. It seems that almost all Celtic and northern Germanic artwork and metalwork styles in the iron age, that developed into the imagery we are familiar with today, came from the people of the steppes. the written language that has been mostly lost was based off a rare form of the Phoenician alphabet that originated from coastal communities of metalworkers and miners in Portugal.
The research also found these cultural norms, artworks and techniques were spread without changing the DNA of the people(people of the steppes didn't conquer and replace the natives) it was literal cultural appropriation
Literally if retards shouting "cultural appropriation" were around then and successful, irish and indeed most western and northern european culture would be utterly unrecognizable.
I agree with you that cultures never operated independently from eacthother, id go as far as to say its been beneficial as a whole. passing on learned techniques and culture as… ahem *memes* is part of the human condition.
Meh whatever, serves as a good example to back you up.
