After the joint proposal for the national stadium for the Olympic Games in Beijing four years ago, Swiss architects Herzog & de Meuron will once again meet with Chinese artist Ai Weiwei to construct the summer pavilion for London's Serpentine Gallery. Last year's pavilion by Peter Zumthor featured a contemplative garden by Dutch landscape architect Piet Oudolf. This year's twelfth pavilion aims to further extract visitors from the urban hustle and bring them underground: the excavation pit will reflect the water table and simultaneously reveal the remains of the foundations of previous pavilions. “The old foundations will create confusion with tangled lines similar to tailored cuts. This will result in an unmistakable landscape that we could hardly conceive ourselves. The resulting random shape is a true gift.” From the exposed remnants of old pavilions, the architects will cut out a new structure, which will include walls and eleven columns. One new column will be added, named the “Joker,” which can be placed completely at random. Above the archaeological excavations, a roof will hover at approximately one and a half meters above the pit, reflecting the changeable London sky.