Art is a language . All art forms serve as vehicles to convey ideas and emotions. The visual arts provide a rich medium for uses as diverse as mass marketing and religious expression. Any language must have a vocabulary. Just as words are combined into sentences to express a particular idea, artists combine line, shape, color, and form to express the artist's vision.
Art is a reflection of the world as perceived by human beings.
Human perception relies heavily on previous experience to impose order on the world around us. We truly see what we expect to see. The physical properties of a viewer's visual system together with their memories and expectations allow spots of pigment on a canvas or glowing dots on a computer screen to be transformed into the uniquely human experience we call art. The visual system begins with the eyes and retina. The retina detects light and converts its presence into nerve signals.