Liminality

"...The Piraha (of the Brazilian Amazon), Everett reveals, possess “the most complex verbal morphology I am aware of [and] are some of the brightest, pleasantest, most fun-loving people that I know.” Yet they have no numbers of any kind, no terms for quantification (such as all, each, every, most and some), no colour terms and no perfect tense. They appear to have borrowed their pronouns from another language, having previously possessed none. They have no “individual or collective memory of more than two generations past”, no drawing or other art, no fiction and “no creation stories or myths.”

All this, Everett believes, can be explained by a single characteristic: Piraha culture constrains communication to non-abstract subjects which fall within the immediate experience of [the speaker]". What can be discussed, in other words, is what has been seen. When it can no longer be perceived, it ceases, in this realm at least, to exist.

After struggling with one grammatical curiosity, he realised that the Piraha were "talking about liminality – situations in which an item goes in and out of the boundaries of their experience. [Their] excitement at seeing a canoe go around a river bend is hard to describe; they see this almost as travelling into another dimension."

from

" A Life with no Purpose" by George Monbiot