Red means stop; green means go. You live in a red or a blue state. You feel green with envy, or you're tickled pink. Colors alert, provoke, attract, divide and unite us.
Thinkers from Plato to Einstein to a new cottage industry of color psychologists have studied the importance of color in our daily lives. But, as Joann and Arielle Eckstut write in their book The Secret Language of Color: "Anyone who claims to be an expert on color is a liar."