A simple change in color can provide a more subtle way of moving the eye around the image. Highlight something with a color border, color shadow or with color streaks. Mental identification of colors in subject matter. Optical The visual effects of an object as it's color changes based on what kind of light it is in. Arbitrary Color choices are subjective.
Artist chooses colors based on design, aesthetic or emotional responses.
We make statements that employ the language of color to describe character traits or human behavior. Cultural references Symbolic color varies from culture to culture. Black in the U.S. in a funeral color, whereas white in India is the funeral color. A bride may wear white in America, but red in China. Time references Color symbolizes eras of time.