Plate 11 from 'Contributions to the Physiology of Vision - Part the First'.

Examples of stereograms, pairs of images for use in a stereoscope to produce a three-dimensional effect. From 'Contributions to the Physiology of Vision - Part the First. On some remarkable, and hitherto unobserved, phenomena of binocular vision.' Paper on stereoscopy by Charles Wheatstone, read at a meeting of the Royal Society on 21st June 1838 and published in 'The Philosophical Transactions of the Royal Society', vol 128 (1838).