14 January 2011
Vol 331, Issue 6014

About The Cover

Cover image expansion

COVER Tens of thousands of books appear in this photograph of the interior of the sculpture Idiom, by Matej Kré n. On page 176, Michel et al. describe an even larger collection: a 5.2-million-book corpus containing 4% of all books ever published. Statistical analysis of this corpus makes it possible to study cultural trends quantitatively. Original sculpture (Municipal Library of Prague): Matej Krén/Photograph: Zdeněk Urbánek