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Stereoscopic Danzig
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First stereoscopic cards with special glasses were invented in 19th century, the most popular were cards in Oliver W. Holmes format. There were also made special, stereoscopic pictures of Danzig. Some of them are reedited to anaglyph, red-blue glasses. If you have one, you can see few 3D views of old Danzig.
Anaglyph glasses.
More about stereoscopy on http://www.stereoscopy.com/
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