LCD - Day 25

So I was thinking a bit of human's natural reaction to colors and light.  We usually use red light to portray a sense that it should not be touched or that there is reason for alarm.  (Usually warning lights are red.)  Green is not a naturally occurring color of light....

Yet, when we see a green light, we know that our laptops are ready to go for another day's worth of work. This is just one example of green signaling success or a good or safe option.  Others include the answer versus ignore button on your cell phone, a standard traffic light, etc.  How many examples can you think of?