Swiss based artists Peter Fischli and David Weiss currently have an exhibition at Spruth Magers Gallery on Grafton Street in London's Mayfair. Entitled Walls, Corners, Tubes the works are a continuation of others made for their Venice Biennial in 2011. Cast in unfired clay and rubber - two very different materials and processes - they are shown in various degrees of scale and reduction. These pieces, on their white plinths, would feel much at home in the British Museum.