Antepavilion names two winners for 2021 competition as legal battle continues A collapsible camera obscura and a bamboo tensegrity structure have been revealed as the two winning designs of the 2021 Antepavilion architecture commission in Hackney, London. The Antepavilion competition, which takes place annually in the UK capital, invites experimental designs and structures for construction at Hoxton Docks on Regent's Canal. Above: a visual of AnteChamber by Studio Nima Sardar. Top image: the All Along the Watchtower pavilion This year's brief called for demountable and transportable interpretations of a bartizan – an overhanging, wall-mounted turret common in medieval fortifications. It is the first time in Antepavilion's five-year history that two winners have been chosen for construction.