Visible things can be invisible. When someone rides a horse in the forest, first you see them, then you don’t, but you know they are there … the rider hides the trees and the trees hide her.
Akeret, Robert U. Photolanguage. New York: W. W. Norton, 2000.
Albers, Josef. Interaction of Color. New Haven, CT: Yale University Press, 1972.
Andreasen, Nancy. The Creative Brain. Dana Press, 2005.
Ang, Tom. Tao of Photography