Form and line are closely related. Form as a compositional element is the SHAPE of an object. It is the space described by line. A building is a form. So is a tree. We perceive them as buildings or trees, and we perceive their individual details, because of the line by which they are composed. Color is a somewhat complex compositional element. The word HUES is used to describe the basic colors of the spectrum (Fig. 0.6). The apparent whiteness or grayness of a color is its VALUE (Fig. 0.7). When we observe a work of art, we can, among other aspects of color, identify, respond to, and describe the breadth of the palette--how many different hues and values the artist has used--and the way the artist has used those hues and values.