the.com/culture

The stuff everyone swims in and almost nobody can name while they're wet.

means The shared beliefs, customs, art, and habits that a group of people pass down and live inside, usually without noticing they're doing it.

from From Latin cultura, 'cultivation, tending of land,' itself from colere, 'to till, tend, or cultivate.' For centuries it meant farming, plain and simple — you cultured soil the way you'd culture crops. Only later did writers stretch it metaphorically: tending the mind or society became 'culture' of a different field altogether, the harvest just less literal.

petri dish origin
Biology still uses culture to mean growing bacteria.
300 definitions
Anthropologists counted over 150 definitions by 1952, doubled since.
invisible rulebook
You notice your own culture mainly when you leave it.
corporate hijack
Companies now sell culture decks instead of actual values.
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