Harald Szeemann’s 1969 legendary exhibition Live in Your Head: When Attitudes Become Form was one of the first shows to bring together new tendencies in 1960s art, such as postminimalism, Arte Povera, Land art and Conceptual art. While the exhibition has been widely discussed and researched, an investigation into its impact has never before been realized in an exhibition. This volume explores the history and myths around When Attitudes Become Form, gathering a group of artists that explore the legacy of Conceptual art. The catalogue follows the office-binder format of the 1969 publication, with newly commissioned essays, a previously unpublished interview with Szeemann by Jens Hoffman and essays and images from over 80 artists in the exhibition, including Allora and Calzadilla, Claire Fontaine, Elmgreen and Dragset, Lara Favaretto, Luisa Lambri and Tino Sehgal.