<Li> Value--Shading used to emphasize form </Li> <Li> Form--3 - D length, width, or depth </Li> <Li> Space--the space taken up by (positive) or in between (negative) objects </Li> <P> Lines are optical phenomena that allow the artist to direct the eye of the viewer . The optical illusion of lines do exist in nature and visual arts elements can be arranged to create this illusion . The viewer unconsciously reads near continuous arrangement of different elements and subjects at varying distances . Such elements can be of dramatic use in the composition of the image . These could be literal lines such as telephone and power cables or rigging on boats . Lines can derive also from the borders of areas of differing color or contrast, or sequences of discrete elements . Movement is also a source of line, and blur can also create a reaction . </P>

When does a part of an artwork have dominance