All artists control their chosen medium using the Sliding Rule of Contrast. This reference defines and illustrates the Sliding Rule of Contrast with strategically placed values, hues, and sizes for comparison. Included are multiple examples that show how to create emphasis in your designs, how to create calm designs, and how to create active designs. Use the Sliding Rule of Contrast along with a color wheel to manipulate color harmonies to your advantage. Store it on your device to reference while shopping or creating in your design studio.