When deciding what colors to use to decorate a room, a color wheel chart is an invaluable tool. The colors on the left side of the wheel are "warm" colors, and the ones on the right are "cool," which is useful for creating a room with a certain mood.
Color wheel charts are also useful for working out what colors go together; for example, colors that appear opposite each other, such as red and blue, are known as complementary colors. Complementary colors can be used as accent colors in a room. You can also use a color wheel to decide which colors look harmonious together and which colors clash with each other.