The Tortoise as a Figure for Withdrawal

The tortoise carries a settled meaning in Indian religious writing that predates the hatha manuals by many centuries. In the second chapter of the Bhagavad Gita, the person of steady wisdom is described as one who draws the senses back from their objects as a tortoise draws its limbs into its shell. The comparison is made about the mind, not about a posture, and the Gita is not a manual of physical practice.

That image is the standard figure for what the yoga literature calls the withdrawal of the senses, the stage in which attention is detached from what the eyes and ears are reporting before concentration proper begins. It appears across the tradition, and a reader of the hatha manuals in the fifteenth or seventeenth century would have met it long before meeting a posture list.

The atlas records the association without asserting that the compilers intended it. Neither the Hatha Yoga Pradipika nor the Gheranda Samhita glosses kurmasana in those terms; both simply describe the arrangement and move on. What can be said is that the name places the posture inside a field of meaning the tradition had already established, and that a practitioner sitting drawn in and still, with the senses turned inward, would have found the animal apt without needing to be told. Where the texts are silent, the atlas marks the silence rather than filling it.