gusset

(via http://streetart.n0tice.com/report/5336/artist-richard-wilson-hangs-out-italian-job-bus-to-teeter-on-bexhill-pavilion-http-www-guardian-co-uk-artanddesign-video-2012-jul-04-italian-job-artist-bus-video)
(see also Italian Job inspires artist to hang bus off De La Warr Pavilion - video)

(via http://streetart.n0tice.com/report/5336/artist-richard-wilson-hangs-out-italian-job-bus-to-teeter-on-bexhill-pavilion-http-www-guardian-co-uk-artanddesign-video-2012-jul-04-italian-job-artist-bus-video)

(see also Italian Job inspires artist to hang bus off De La Warr Pavilion - video)