The use of opposite or juxtaposing elements in an image creates contrast. Opposite colors on the color wheel, for example, can contrast. We can also see contrast in value ranges with the extremes being black and white. Contrast can be a difficult principle to work properly. Too much, or improper use of contrast can weaken visual unity and become chaos for the eye to take in. That said, good use of contrast can center the attention of the viewer and create a delicate harmony in the composition.