The 6 green-green red-red types - from the Manners Light to the Compass Light
Green-green if you like it, red-red if you don't. The phrasing out of CORTIS's "REDRED" spread as fast as it did because a traffic light needs no explanation. What's more interesting is that the same person can walk in front of six people and get six different colours — because nobody has the light installed in the same place. And where yours sits is usually where something already went wrong once. Here's what each of the six is trying to protect, and what each of them can't see. Not sure which one you are? Take The Green-Green Red-Red Test (12 questions) and find out first.