Sociologists often speak of the aspects of our world which are taken-for-granted, unquestioned assumptions that provide our bedrock of lifeworld. These are things that are entirely humanly constructed cultural concepts, but which we experience as pre-existing, unexamined "reality."
This idea in sociology of phenomenology or sociology of knowledge is hard to communicate to non-sociologists (and even some sociologists). It is hard to step outside of one's own lifeworld and examine the unexamined! But this video based on David Foster Wallace commencement address to the 2005 graduating class of Kenyon College does an extraordinary job of getting the idea across.
THIS IS WATER By David Foster Wallace - 4 Translation(s) | Dotsub