Blue and gold, emptiness and immateriality, the body and the elements: all typical themes and motifs for Yves Klein (1928–62), whose work has emerged as a key passage between postwar painting and the neo-avantgarde of the ’60s and ’70s. Klein’s blue (with which this retrospective opens and on which it dwells) is a radioactive ultramarine, intensified to the point of provocation, where, as the artist himself indicated, it transcends itself and suggests the universe, immateriality, the Great Void of pure sensibility. Klein interwove magical-alchemical traditions with ritualism and the Christian