Informed by the way the human ribcage is held in place by the tension from the surrounding muscles and skin, architecture studio Ibuku created a self-supporting roof made entirely from bamboo for the gymnasium of Bali’s Green School. Architecture studio Ibuku has completed The Arc gymnasium for a private school in Bali featuring a complex double-curved roof made entirely from bamboo. The Arc is the latest building to be completed on the site of the Green School – a private educational institution that promotes sustainability through learning in a natural environment.