Jonah, in your piece today, you talk about the chaos if the color scheme for traffic lights was changed (yes, I focussed on the big issues). In fact, during the Cultural Revolution, this was suggested by some of the more enthusiastic Red Guards. Red as the color of revolution should mean ‘go’, they said. Chou en Lai talked them out of it. Cunningly, he argued that stopping at red lights indicated respect for the revolutionary order. Who could disagree with that?

Just thought I would pass this on.