Inspired by the New York Public Library’s Stereogranimator (http://stereo.nypl.org/), we’ve created a few animated stereographs from the collections on New York Heritage!
Stereoscopic cards were precursors to the iconic View Master toy. Users slid the stereograph into a viewer and looked at each half of the image with a different eye, causing an optic illusion of depth because each separate image was taken from a slightly different angle.
You might not be able to spot the subtle differences between the two halves of this stereographic image, Burial Mound of the Seneca Indians at the Old Castle, Kanadesaga, (Geneva, N.Y.) from 1879:
Here are some other examples at work:
Image shows stereograph postcard with view of Ivy Arch bridge in Delaware Park with flower beds and a well maintained carriage road underneath the bridge, circa 1905-1910.
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