Colour helps establish a mood for your composition. When light waves strike an object and reflect back to the optic nerve in a human’s eyes, the sensation they perceive is called color. Artists and designers use color to depict and describe the subject. Color is used by designers to portray mood, light, depth, and point of view. Designers use the color wheel and the tenets of color theory a set of guidelines for mixing, combining, and manipulating colors to create color schemes.