a mnemonic for emergent structure

“Within 6 square miles there is either a hill or a valley.”
This can be taken as a an allusion to the 6-people theorem, or, more generically, to the phenomenon of emergent structure. It can also be taken as a ‘stylized fact’.
(An analytic mnemonic, if one so prefers, can be given as follows: “If x is greater than or equal to 6, then there exists a y such that |f(x,y)| is greater than or equal to 1.”)
(Note: If you wonder why I spelling out the symbols, such as “is greater than or equal to” instead of just using the symbol, it’s because WordPress does not allow the symbol (replacing it with a little square)).
keywords: Ramsey Theory, within six square miles, emergent order