Portico de la Gloria is just not wonderful art to look at but is is shelter. Goergia O Keeffe has used are to express feeling that could not be spoken. Line, defines a shape of shapes, such as the Dairy by Roge Shimimura and the Wall Painting with Four Hoorses. Color, is defined as hue,value, and intensity. Hue is red,yellow,blue,ect.
Value is the lightness or darkness of the hue.
Intensity is the dullness or brightness of a color. Dairy compaired to Christine Presenting Her Book. Space may be neg. as well, such as in the Human Figure. Composition is the make up of art, arrangment.