The following paragraph is quoted from Steven Pinker's "The Language Instinct" and it's originally presented by Benjamin Lee Whorf in his "Language, Thought, and Reality"
“We dissect nature along lines laid down by our native languages. The categories and types that we isolate from the world of phenomena we do not find there because they stare every observer in the face; on the contrary, the world is presented in a kaleidoscopic flux of impressions which has to be organized by our minds - and this means largely by the linguistic systems in our minds. We cut nature up, organize it into concepts, and ascribe significances as we do, largely because we are parties to an agreement to organize it in this way - an agreement that holds throughout our speech community and is codified in the patterns of our language. The agreement is, of course, an implicit and unstated one, BUT IT’S TERMS ARE ABSOLUTELY OBLIGATORY; we cannot talk at all except by subscribing to the organization and classification of data which the agreement decrees.
I think I may know literally what does "The categories and types that we isolate from the world of phenomena we do not find there because they stare every observer in the face" mean, or maybe not.But I don't see the logic it bears. My understanding is that we isolate the categories and types because they stare every observer in the face, what does that supposed to mean?