The 2012 Serpentine Gallery Summer Pavilion, designed by Herzog & de Meuron and Ai Weiwei, opened on i June 2012 in Kensington Gardens, London, UK.
Eleven columns characterising each past pavilion and a twelfth column representing the current structure support a floating platform roof, which can collect rainwater. The pavilion's interior is clad in cork, a sustainable building material chosen for its unique qualities and to echo the excavated earth.
Below is a video of some of the preparation and completion of the pavilion:
Serpentine Gallery website.