Ashtavakra Gita

As a shell may seem to be silver, and a rope a snake, ignorance makes the self seem to be a world

These are the two most famous stock examples of mistaken perception in the history of Indian philosophy, later formalized by Shankara's Advaita school.

Mother-of-pearl mistaken for silver in dim light, and a coiled rope mistaken for a snake at dusk, are the two most frequently used stock examples of mistaken perception (adhyasa, "superimposition") across the history of Sanskrit philosophy, later formalized as paradigm cases by Shankara's Advaita Vedanta. What makes both examples useful is that the error is not random: the shell really does resemble silver in certain light, and a coiled rope really does resemble a snake in poor visibility, so the mistake arises from a genuine, structured resemblance rather than pure fantasy. Applied to the world's appearance out of the self, the analogy suggests something similarly structured: ignorance (avidya) does not invent the world from nothing but misreads a real appearance, the self's own capacity to know and manifest, as something else, an external, separate world. Unlike a simple hallucination, which vanishes once you look more carefully in the ordinary way, correcting the shell-silver or rope-snake error requires a shift in the perceiver's whole framework of recognition, exactly the kind of shift the Gita has been describing across all five chapters so far.

Ashtavakra Gita