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There are so many! For a start: "Traffic lights: Red means stop, yellow means caution, and green means go. Yellow signs also warn drivers of upcoming curves, pedestrian crossings, and a animal crossings. Patriotism: Most, if not all countries have a flag. The colors of each flag are usually seen as patriotic. Red, white, and blue symbolizes patriotism in the U.S.A. Holidays: Red and green are favorite Christmas colours. Colors of Autumn such as orange, brown, yellow and red are associated with Thanksgiving with black and orange associated with Halloween. Pastel colors are used for Easter. Emotions: Blue is seen as conservative. Red is power and aggression. Brighter color such as yellow and orange represent warmth not only with emotions but also with temperature. Cool colors are blue, green, black or any color with a dark shade. Ecology: Obviously green is the major color symbolizing ecology. The new phrase for people or companies who find ways to cut back on electricity, fuel, or things that damage the environment is 'going green.' " Source: http://www.princetonol.com/groups/iad/lessons/middle/color2.htm