This file is a stereogram. Stereograms are stereoscopic images or animations which combine left and right frames showing slightly different visual angles to allow for 3D perception.
The stereogram uses the side-by-side parallel-view method. The left frame shows the left eye's perspective, and the right frame the right eye's perspective. It might be possible to view this image without a viewing device by diverging your eyes to visually combine the frames, or a stereoscope may be used.
DescriptionSchulmuseum-bhv stereoskop hg.jpg
English: Stereoscope viewer, on display in the Schulhistorische Sammlung (School Historical Museum), Bremerhaven, Germany. By putting a picture in the viewer and looking at it through the viewer, a three-dimensional (stereo) image of the object can be seen. The stereo pictures shown consist of two different images of the same scene taken by a special stereo camera with two lenses an eyes-distance apart.
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