💎 On how quickly in groups form (even when the connection is obscure)

With sports affiliations, random birthplace suffices, and in business it is where you work. To test this, the British psychologist Henri Tajfel split strangers into groups, tossing a coin to choose who went to which group. He told the members of one group it was because they all liked a particular type of art. The results were impressive: although A) they were strangers, B) they were allocated a group at random and C) they were far from art connoisseurs, the group members found each other more agreeable than members of other groups.

Excerpt from: The Art of Thinking Clearly by Rolf Dobelli