The archives of the Swedish-born US artist Claes Oldenburg and his late collaborator and wife Coosje van Bruggen “are among the most significant and visually rich archives ever to be acquired by the Getty Research Institute”, according to its director, Mary Miller. Oldenburg’s own meticulous records date from the 1950s and include 450 diaries and notebooks, and more than 2,000 sketches and collages documenting his performances, sculptures and projects throughout his career. His joint archive with Van Bruggen contains research, plans and correspondence relating to the more than three dozen witty monuments of everyday objects they conceived together, such as Minneapolis’s 51ft-long working fountain Spoonbridge and Cherry (1988). Jan Staller; © Claes Oldenburg and Coosje van Bruggen