A special category of images which are only visible to person with two eyes. It uses an optical illusion to show a 3D image through a 2D image.
It uses the fact that brain interprets 3D objects by using the differences between the two 2D images seen by our two eyes. To watch these images you just have to push your focus behind the image such as column n seen by left eye overlaps with column n+1 seen by the right eye .
Some Samples:
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