'In Norway and here, to put one rock on top of another rock in the wilderness is the first thing you do if you want to make a mark. When you walk and you want to find your way back... you make this mark. It is a very archaic, simple thing, but it is referencing the [Robert] Venturi duck. We wanted to make something that forces you to stop your car and get out to take a photograph.' Peter Fischli

The Serpentine Gallery is proud to present Rock on Top of Another Rock (2010/13) by Swiss artists Fischli/Weiss.

The first public sculpture by the artists to be commissioned in the UK, the work, situated near the entrance to the Serpentine Gallery, comprises two large granite boulders seemingly balanced one on top of the other. Standing approximately 5.5 metres high, Fischli/Weiss's deceptively simple gesture is incongruous and startling, and yet also in tune with its site. Rock on Top of Another Rock oscillates between stability and instability, construction and destruction.

Like many of the artists' best-known works - including the Equilibres/Quiet Afternoon photographs on display in the Serpentine's Sackler Centre of Arts Education until 7 April 2013 - the rocks are imbued with the artists' unmistakeable wit and serious sense of the absurd. A parallel project, commissioned by the National Tourist Routes in Norway, saw two boulders installed in the Norwegian countryside along the Valdresflya tourist route.

Since they began working together in the late 1970s, Swiss artists Peter Fischli (born 1952) and David Weiss (1946-2012) have become known for their transformations of the common-place and their finely-judged balance of humour and seriousness. Fischli/Weiss's practice crosses a wide range of media, but underpinning all of their work is a spirit of discovery that encourages us to take a fresh look at our surroundings.

The installation in Kensington Gardens is organised by the Serpentine Gallery in collaboration with The Royal Parks and Modus Operandi.