In our latest competition, we've teamed up with MAD Architects to give away five copies of a book outlining the studio's 10 most significant projects.
The book, called MAD X, accompanies a year-long exhibition of the same name which is currently running at the Centre Pompidou in Paris until April 2020.
Five winners will receive a copy of MAD X, which illustrates 10 projects by the Chinese studio through models, sketches and photography by Hélène Binet, Hufton & Crow and Iwan Baan.

MAD X collects representations of various parts of the design process, including images of the models and draft sketches, as well as the photography.
The title interprets the letter X as the Roman numeral for the number 10, but also as a symbol for an unknown value. "'X' signifies the unknown," said Ma Yansong, founder of the studio. "With 'X', I hope to express my desire for exploring uncharted territory, which I believe is more important than reiterating the past."

One of the projects in the book is Chaoyang Park Plaza, a mixed-use complex located in one of the largest parks in the world completed by MAD in 2013.
Modelled after mountains and hilly landscapes, curved fins on the buildings reflect ridges on rock formations.
Initial sketches of the complex and Baan's photography series accompany the dark, pebble-like model which features on the book's cover and also in the exhibition.

Elsewhere in the exhibition, the undulating forms of Harbin Opera House are sliced an...