World's oldest optical illusion?

Optical illusions are images or visuals that appear to us to be different than they are. To put it another way, optical illusions happen when our eyes convey information to our brains that leads us to believe something that isn't true.
"Illusion" is derived from the Latin word illudere, which meaning "to mock."
 
Physiological illusions exist in some cases. This indicates that they are caused by a physical mechanism in the eyes or brain.
 
Illusions of perception are fascinating. Period. There's no denying that posts displaying such deceptions frequently leave viewers perplexed. At the same time, those are the shares that keep people entertained. In truth, there are numerous videos and photographs of optical illusions on the Internet. Like this one, which has numbers hidden in a black and white swirl and is a great addition to the area of fascinating optical illusions .

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It's possible that this is the original duck-rabbit illusion, which was discovered in a cave in France in 2010. It's made up of two overlapping images carved out of rock that, depending on how you look at it, resemble a mammoth and a bison. While it's possible that this is the first optical illusion in practice, no one knows if it was intended to be that way or if it was merely a game of overlapping traits. But, since both art and magic are in the eye of the beholder, we think it's okay to call it an illusion if it works.
For decades, artists and psychologists have experimented with visuals that can deceive our minds or be understood in a variety of ways. But none of the other optical illusions we'd seen so far have been as old as this one, which is engraved in stone.
The Airavatesvara Temple is a Hindu temple in Kumbakonam, Tamil Nadu, India. It's a Chola dynasty gem that dates back over 900 years. And there's this beauty among the gorgeous 12th century Dravidian architecture and carved ornamentations of chariots and avatars that would fit right in with our list of the best animal optical illusions. It appears to depict two conjoined creatures with one head. But which animal do you think you're looking at?


 
 
 
 
The animal on the right is plainly an elephant, but the animal on the left is clearly a bull staring up towards the sky if you cover the torso and legs of the elephant. In Hindu mythology, the bull Nandi represents Lord Shiva, while Airavat, a fabled white elephant, represents Indra, the monarch of heaven. In the video below, the two animals in the Airavatesvara Temple optical illusion are separated to show how they might seem on their own.
Many of the optical illusions we've seen generated digitally with current software have astonished us, but the fact that artists carved an optical deception into stone so long ago is remarkable. Even more than eight centuries ago, it appears that we humans enjoyed seeing sights that deceived our thoughts.
 

Take a look at these optical illusions: 
A cat and a moose are concealed in the viral optical illusion. What animal do you see? 

A Snow Leopard, Leopard and Cat are hiding in the images. Can you spot the hidden animals?