The Pallavas at Mamallapuram, carved the story of the descent of the Ganga on an enormous rock. http://www.boloji.com/history/041.htm This panel on the right wall honors the Trivikrama (aka Vamana) avataar of Vishnu. With his two feet he occupies all earth and the skies, and with his third step, suppresses the egotistical King Mahabali. Mamallapuram was previously called Mahabalipuram after this king. http://arunshanbhag.com/2008/06/12/varaha-mandap/