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You must have seen these images, typically used for displaying optical illusions. For example, in the first image, do you see a duck or a rabbit? In the second image, do you see an old woman or young woman? Now National Geographic has reported on one of the oldest such illusions which comes from a Paleolithic cave in France.
In a particularly striking example, a small figurine has been given the details of a bison on one side and those of a mammoth on the other. The Paleolithic artist was clearly playing with the similar contours of the two animals and creating a single object that could be flipped to represent one species or the other.[World’s Oldest Optical Illusion Found? ]
You can see the image here. This prompted Ravages to sent the following photo, found in temples in Tamil Nadu. Do you see a bull or an elephant?
Can I get the name of the temple in TN, where we can see this bull/elephant?
This particular photo is from Darasuram temple, about 4 kils from Kumbakkonam. Other Chola temples have similar panels. I also think that the Pallavas had very similar ideas.
Here is yet another in Thirubhuvanam in Tamil Nadu http://picasaweb.google.com/107736469396282148289/Thirubhuvanam#5557614082809033618