The oldest optical illusion in the world is in Airavatesvara Temple

The oldest optical illusion in the world is in Tamil Nadu’s Airavatesvara Temple. The rishabha-kunjara (bull and elephant in Sanskrit) carving from Chola architecture is said to be 900 years old. In the carving, a bull and an elephant share the same head. The bull is Nandi, the sacred vehicle of Lord Shiva, while the elephant, Airavat, symbolizes the divine mount of Lord Indra, the king of heaven. The temple, located in Kumbakonam, was built by Rajaraja Chola II and is on the UNESCO World Heritage Site list of Great Living Chola Temples.