John Roberts is Professor of Art and Aesthetics at the University of Wolverhampton, UK. He is author of The Intangibilities of Form: Skill and Deskilling in Art After the Readymade (2007), The Necessity of Errors (2010), Photography and Its Violations (2014), Revolutionary Time and the Avant-Garde (2015), Thoughts on an Index Not Freely Given (2016) and His The Reasoning of Unreason (Bloomsbury 2018) and co-editor of Boris Arvatov, Art and Production (2017)