Stereoscopic Vision

Stereoscopic vision makes depth perception possible. By crossing your eyes while looking at these pictures, the brain perceives a combined three-dimensional image. Keep your eyes level with the pictures. Place your fingertip between the pictures just below the sun and look at your fingertip while you bring your finger toward your eyes. When your fingertip is approximately 7 inches from your eyes, the pictures in the background will combine into a 3-dimensional picture.