Stereoscopic image
Cross
your eyes to merge the two pictures into one. Experiment by changing
the distance between your eye and the screen. A stereoscopic viewer
won't work on this pair of images; the left and right sides are
reversed for cross-eyed-vision.
Some
people may see the effect easier when the image is tiled; set your
browser to full screen size, then click the image closest to your
screen width: 1600x 1200x 800x
More stereoscopic images,
including more Hexacubes