'Google Cardboard' stereo viewer made of folded card, for use as a low cost mount for a smartphone to adapt it into a virtual reality headset when used with the 'Google Cardboard' software application; launched at Google's software developers' conference in San Fransisco, California, June 2014

Black metal folding pocket stereoscope, Air Ministry issue, used in interpreting aerial stereo photographs, 1939 - 1945

Simple Brewster stereoscope, unsigned

Stereoscope, early Claudet binocular stereoscope in purple leather with brass eye pieces, in a fitted case with stereo-cards, stamped in gold by London Stereoscopic Company, London, late 1850s

Brewster-pattern hand-held stereoscope with Japanese lacquerwork decorated body, with design of cranes and pine tree, unsigned, 1860s

Brewster-pattern hand-held stereoscope with Japanese lacquerwork decorated body, with design of cranes and pine tree

Hand-held stereoscope on a stand, to H.C. White's U.S. patents of 1896, 1896 and 1902, with 1900 World's Fair medallion in the centre of the hood, sold by Fine Art Photographer's Publishing Co., London

Walnut-veneered stereoscope on brass stand, unsigned, late 1850s

'Improved Cosmorama' stereoscope, with hinged top and back panels, each with foil mirror and pair of push-pull focusing lenses, on stand, by Burfield and Rouch, 1854 - 1859

Stereoscope, the 'Lothian' hand-held stereoscope, by A.H. Baird, Edinburgh, 1895

Brewster-pattern hand-held stereoscope, with hinged top and ground glass screen, lacquerwork decorated body and brass, blue enamel and mother-of-pearl inlay, 1860s - 1870s

Stereoscope, mirror achromatic hand-held stereoscope, no. 1481, patent no. 2112, by Smith, Beck and Beck, 1859

Magic Stereoscope, depicting The Three Graces, on a stand and base, by Negretti and Zambra, London, 1856

Stereoscope, Mascher’s Improved Stereoscope, case with pair of viewing lenses on a hinged panel, holding a stereo-ambrotype of an unidentified lady, 1850s

Brewster-pattern stereoscope, on a barley-sugar twisted wooden stand, probably 1860s

Collapsible stereoscope, folding to form into its mahogany storage box, patent no. 3153, by W.J. Gibbons, 1860