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3D images: Sylvan Grotto, Long Branch, New Jersey (anaglyph)
Sylvan Grotto, Long Branch, New Jersey, appr. 1890's.
Viewing instruction: Look at the image with 3D specs, that is, glasses with a red and a green filter. The red filter should be to the left and the green to the right. Look at the picture from a distance of at least arm's length. The optimum effect usually doesn't appear until after 20 to 40 seconds, so give your eyes and brain some time to adjust.
About 3D images