Earlier quoted context omitted.
For what it is worth, numbers are not necessarily a 'universal concept'. One of the most talked about examples is Piraha[0], a language which doesn't really represent numbers. This is interesting because a study done by Everett and Frank[1] shows that this can actually have effects on cognition, providing some evidence for the Sapir-Wharf hypothesis[3] [0] https://en.wikipedia.org/wiki/Pirah%C3%A3_language [1] http:/…
One of the reasons Everett is talked about so much is because his claims are controversial. Many linguists have criticized his methodologies. I have a background in linguistics but have never looked into Everett's work too thoroughly, but from what I have seen I am skeptical of his claims that Piraha lacks recursion. Still, an interesting line of inquiry and it would be nice if there were enough linguists to actually…
If I had to boil it down to a sentence, Everett's claim ultimately was not that the Pirahã can't think recursively, it's that their language reflects a cultural aversion to referring to things that aren't concretely present, and this impacted their grammar for subordinating clauses.
OTOH, and quite separate from the recursion issue, there has been some really interesting research on Pirahã perception of number. The ScienceDirect link/paper in the parent is well worth your time; it's also here https://www.researchgate.net/publication/5308732_Number_as_a... and background at LanguageLog http://languagelog.ldc.upenn.edu/nll/?p=341