Śivasaṃhitā 1.38

Two of Indian philosophy’s most celebrated epistemological examples appear together here: the rope mistaken for a snake (rajju-sarpa) and the mother-of-pearl mistaken for silver (śukti-rajata). Both cases demonstrate adhyāsa — the superimposition of an unreal object onto a real substratum. Crucially, the error is not pure fabrication; it requires an actual basis upon which the false perception is projected.

Sarpabuddhi is a technical compound meaning «snake-cognition» — the full cognitive act of structuring experience around a non-existent object. Rajju (rope) and śukti (oyster shell, mother-of-pearl) are the real substrata; sarpa (snake) and rajata (silver) are the superimpositions. This substratum-superimposition distinction is the cornerstone of Advaita epistemology, elaborated extensively by Śaṅkara.

The rajju-sarpa analogy appears in the Upaniṣads and is systematized in Śaṅkara’s Vivekacūḍāmaṇi and Brahmasūtrabhāṣya. Its deployment in the Śivasaṃhitā signals that this haṭha text situates physical practice within a rigorous philosophical framework. Understanding why the world is misperceived is the necessary precondition for understanding what yoga is actually undoing.