“[I]f you go to the Brooklyn Public Library seeking a copy of ‘Tintin au Congo,’ Hergé’s second book in a series, prepare to make an appointment and wait days to see the book. ‘It’s not for the public,’ a librarian in the children’s room said this month when a patron asked to see it. The book, published 79 years ago,” has been “held under lock and key” since 2007, after “a patron objected, as others have, to the way Africans are depicted in the book.”