In her artist’s book 82 Postcards , Roni Horn (born 1955) takes the titular medium and classifies its photographs, designs and text in a unique system of symbols and visual codes. Her translation of these mementos—mostly from North America, but some from farther afield—lays bare the interplay of their various parts, questioning how pieces of content come together to form the basis of complex cultural phenomena like tourist attractions, popular science and national identity.