The artist determines what the center of interest (focus in photography) of the art work will be, and composes the elements accordingly. The gaze of the viewer will then tend to linger over these points of interest, elements are arranged with consideration of several factors (known variously as the principles of organization, principles of art, or principles of design) into a harmonious whole which works together to produce the desired statement – a phenomenon commonly referred to as unity. Such factors in composition should not be confused with the elements of art (or elements of design) themselves.