Ebéd a Rockefeller tetején - sztereoképeslap
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To see the full stereo effect of this famous photograph, look through the lenses and squeeze the viewer until the picute becomes clear.
This toy/card is based on the invention very popular in the 1850s. The stereoscope is a device for viewing a pair of separate images, depicting left-eye and right-eye views of the same scene, as a single three-dimensional image.