![Cover of ‘01: Formless,’ left, and ‘02: Double, right.’](https://pentagram-production.imgix.net/wp/592c98aa13ab9/sf-0-02-300dpi1.jpg?rect=%2C%2C%2C&w=640&crop=1&fm=jpg&q=70&auto=format&fit=crop&h=427)
Cover of ‘01: Formless,’ left, and ‘02: Double, right.’
![Front and back cover of ‘Formless.’](https://pentagram-production.imgix.net/wp/592c98ab97625/sf-1-formless-01-300dpi.jpg?rect=%2C%2C%2C&w=640&crop=1&fm=jpg&q=70&auto=format&fit=crop&h=427)
Front and back cover of ‘Formless.’
1 Cover of ‘01: Formless,’ left, and ‘02: Double, right.’ 2 Front and back cover of ‘Formless.’ 3 Opening spread with title page of an essay by Vito Acconci, right.
![Opening spread with title page of an essay by Vito Acconci, right.](https://pentagram-production.imgix.net/wp/592c98acc08bc/sf-1-formless-02-300dpi.jpg?rect=%2C%2C%2C&w=640&crop=1&fm=jpg&q=70&auto=format&fit=crop&h=427)
Opening spread with title page of an essay by Vito Acconci, right.
![The orientation of the pages changes with each essay.](https://pentagram-production.imgix.net/wp/592c98ae13ce6/sf-1-formless-03-300dpi.jpg?rect=%2C%2C%2C&w=640&crop=1&fm=jpg&q=70&auto=format&fit=crop&h=427)
The orientation of the pages changes with each essay.
![The reader eventually moves their way around the entire form of the book.](https://pentagram-production.imgix.net/wp/592c98af2e559/sf-1-formless-04-300dpi.jpg?rect=%2C%2C%2C&w=640&crop=1&fm=jpg&q=70&auto=format&fit=crop&h=427)
The reader eventually moves their way around the entire form of the book.
![Image of ‘The Weather Project’ by Olafur Eliasson, right.](https://pentagram-production.imgix.net/wp/592c98b0692a2/sf-1-formless-05-300dpi.jpg?rect=%2C%2C%2C&w=640&crop=1&fm=jpg&q=70&auto=format&fit=crop&h=427)
Image of ‘The Weather Project’ by Olafur Eliasson, right.
![Front and back cover of ‘Double.’](https://pentagram-production.imgix.net/wp/592c98b1964dd/sf-2-double-01-300dpi.jpg?rect=%2C%2C%2C&w=640&crop=1&fm=jpg&q=70&auto=format&fit=crop&h=427)
Front and back cover of ‘Double.’
1 Image of ‘The Weather Project’ by Olafur Eliasson, right. 2 Front and back cover of ‘Double.’ 3 Table of contents.
![Table of contents.](https://pentagram-production.imgix.net/wp/592c98b31290f/sf-2-double-02-300dpi.jpg?rect=%2C%2C%2C&w=640&crop=1&fm=jpg&q=70&auto=format&fit=crop&h=427)
Table of contents.