The base of the pavilion is sunken beneath the lawn of Kensington Gardens, where the imagined previously buried foundations of the past eleven annual pavilions have been unearthed and lined with cork to form a network of trenches.
Twelve columns are positioned amongst these channels, representing each of the pavilions past and present, and supporting a circular roof.
A pool of water covers the roof, but can be drained into an excavated well to provide an elevated viewing platform or dance floor.
Cork-covered stools shaped like mushrooms provide seating for visitors underneath this canopy.
The temporary pavilion will be open until 14 October.
See more shots from the press preview in our Facebook album.
Jacques Herzog gave us a private tour of the building earlier today, which we'll publish on Dezeen soon.
Photography is by Jim Stephenson.