twentieth century, simpler, mirrored devices, like the shomescope (1914), snapscope (1925 to 1935), some of them toys, including the reflectoscope (1930s), were claimed to provide three-dimensional effect from two-dimensional single images. References External links Princeton University Library's Megalethoscope George Eastman House Online Megalethoscope Viewer George Eastman House blog post on the Megalethoscope Audiovisual introductions in 1861 Optical devices 3D imaging Photography Photography in Italy 19th-century photography Virtual reality accessories