Two eyes...four controls...one brain. Vision is a two-way street for recording in the brain the ingredients of knowledge and intelligence - and back again as the control by the brain to make seeing possible. This fanciful drawing of a “cross-section” of the head illustrates these two processes. One the reverse is the “Story of Vision” This classic illustration artwork was done by artists from the Disney Studio. 8 1/2” x 11”. Pad of 50.