Dezeen has teamed up with publisher Prestel to give away five copies of a book about London's brutalist architecture, featuring nine pull-out 3D models.
Brutal London: Construct Your Own Concrete Capital by Zupagrafika contains photographs and descriptions of brutalist buildings across the UK capital, including illustrations that can be detached and constructed into 3D models.
It promotes one of the 20th century's most controversial architecture movements, which has come back into vogue in recent years.
"This book will enable a wider audience to engage with the brutalist architecture of London in a new year through crafting the models with their own hands," said Foster.
Alison and Peter Smithson are believed to have been the first architects to adopt the term brutalism – deriving from the French term for raw concrete, béton brut, used by Le Corbusier in the late 1940s.
Many examples of the style have faced demolition in recent years. Most recently, a campaign to save the Smithsons-designed Robin Hood Gardens estate in London failed and the building is due to be pulled down soon.
Brutal London: Construct Your Own Concrete Capital was launched by Prestel in October 2016.
Five readers will each win a copy of the book, but it can also be also purchased online for £13.59.
Competition closes 6 February 2017. Winners will be selected at random and notified by email, and their names will be published at the top of this page.