Few images conjure techno-modern utopia’s discontents like Buckminster Fuller’s Montreal ‘Expo 67’ biosphere in flames. Lit by a welder’s spark during structural renovation in 1976, the acrylic carapace of the icosahedron dome burnt fiercely for 30 minutes before extinguishing. Probably the lean efficiency of Fuller’s structures – he converted, as the critic Martin Pawley nicelyread more