Why and how did the descendants of the tribal people whose ancestors were brought to Assam from other parts of India cease to be tribal people in their present environment? The answer lies in the peculiar rules that determine such recognition, according to which a person’s tribal identity is irrevocably and forever linked to her or his place of origin — in the present instance, the persons’ ancestral origins. For instance, the progeny of a Munda, a recognised tribal community in Jharkhand and other contiguous States, one of the 96 communities listed under the category, Tea Garden Labourers, Tea Garden Tribes, Ex-Tea Garden Labourers and Ex-Tea Garden Tribes in the official ‘Central List of Backward Classes, Assam,’ who was taken to Assam to work in the tea gardens over a century-and-a-half ago has lost his tribal identity, though were such a person to return to his (now notional) ancestral place, he would regain his tribal identity.