The beautiful stone figure depicts Patanjali as the Adishesha. Patanjali, apart from being the Yogacharya, is also known as the Adishesha, which can be understand as "the primordial snake" or the primordial form of Lord Vishnu.
In Hindu mythology Adishesha, sometimes also known as "Ananta" (The Endless One), is the thousand-headed ruler of the Nagas, the snake race who guards the hidden treasures of the earth. Since yogic knowledge is the ultimate the secret treasure, many yogins still bow to Adishesha before beginning their daily yoga practice.
Here the body of patanjali is shown as being coiled to form an expansive comfortable couch on which the god Vishnu rests and reclines during the intervals of creation. The serpent's thousand heads symbolize infinity or omnipresence. These heads reach up and out like a protective canopy or umbrella over Vishnu and on that "umbrella" rests our earth.
The snake's body is soft and gentle enough to serve as a couch for a god. But it is at the same time firm and steady enough to support the whole Earth.