1. Jirousek, C.Two Dimensional Illusion of Three Dimensional Form.http://char.txa.cornell.edu/language/element/form/formillu.htm(accessed August, 2014) .
2. Wikipedia Tomb wall depicting Queen Nefertari, the great royal wife of Pharaoh Rameses II.http://en.wikipedia.org/wiki/Art_of_ancient_Egypt(accessed August, 2014) .
3. “Escaping Criticism” by Pere Borrel del Caso (1874).http://en.wikipedia.org/wiki/Trompe-l'%C5%93il(accessed August, 2014) .
4. Wikipedia Cubism. http://en.wikipedia.org/wiki/Cubism(accessed August, 2014) .
5. Museum of Modern Art “The Reservoir, Horta de Ebro” (Picasso, 1909).http://www.moma.org/collection/object.php?object_id=78718(accessed August, 2014) .