Gall's Law: A complex system that works
is invariably found to have evolved
from a simple system that worked.
A complex system designed from scratch never works
and cannot be patched up to make it work.
You have to start over with a working simple system.
John Gall, Systemantics: How Systems Really Work and How They Fail
Simple rules produce complex behavior.
Complex rules produce stupid behavior.
Andrew Hunt, 37 Signals