Contrast The difference in visual properties that makes an object distinguishable from other objects and the background. Symmetrical Balance Arrangement of elements centered in the frame Asymmetrical Balance Arrangement of elements off center in the frame Form Points, lines and shape elements in a photographic composition. Point A design element that becomes the center of the viewer's attention in a photograph. Line A design element composed of many points that displays more movement and eye flow in a photographic composition. Shape Design element created by the enclosure of lines. There are 3 basic shape forms - circle, rectangle, triangle. Rhythm Design structure created by points, lines and shapes through a sequence of alignment and repetition with direction. Pattern Design structure created by points, lines and shapes repeating in an area. Texture The primary quality of the surface of an object. Two Thirds rule This rule states that an image should be imagined as divided into nine equal parts by two equally-spaced horizontal lines and two equally-spaced vertical lines, and that important compositional elements should be placed along these lines or their intersections. Basic design principles useful in photographic compositions.