Inspired by Hegel's invocation of philosophy as a painting of 'grey on grey', this collection of essays explores the rich scope of ideas implicated by grey, as a colour and a philosophical concept. The volume attests to the insistent logic of grey´ s self-differing at stake in the ontology of artworks and images, revealing their deadlocks and potentials both past and present. Crossing art history, visual studies, philosophy, anthropology, media, literary and decolonial studies, contributions consider the immanence of grey on grey in rethinking the temporalities, techniques and media of art.