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In page Cairn:

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There remains a Jewish tradition of placing small stones on a person's grave as a token of respect, known as visitation stones, though this is generally to relate the longevity of stone to the eternal nature of the soul and is not usually done in a cairn fashion.[3] Stupas in India and Tibet probably started out in a similar fashion, although they now generally contain the ashes of a Buddhist saint or lama.[citation needed]