Ethnographer Problems

This is a quote from  book review I read today:

In the Innocent Anthropologist, Nigel Barley recounts an occasion when, in the company of a native informant, he was attending an indigenous religious festival. Informant: “The man in the ostrich-feather head-dress is giving…”; Barley: “But I don’t see a man in an ostrich-feather head-dress”; “No, he’s not wearing it today…” As Michael Polanyi used to insist, implicit or tacit knowledge makes social life possible; yet its recovery is difficult…