Stereoscopic Photography (contd.)
		• Stereo pictures are taken by means of a camera with two lenses. This provides two separate pictures 6 cm apart, about the distance between the eyes. Although the pictures appear the same, they are not. When looked at in a viewer, which has prismatic lenses, your eyes will blend the two views into one and the brain perceives it in three dimensions the same as normal vision.
				Wet Plate Stereo camera, 1860