An aluminium spine beam runs the length of it, Eyre describes the structure as a sort of boat, hidden inside, designed with Ian Firth, then at Flint & Neill. Hung on that spine is a concertina of twenty-three square portals, with glass in the gaps between them.
Each portal is turned four degrees from the one before it. Twenty-three of those, and the bridge has performed a quarter-turn between one building and the other. It starts square to the school and arrives square to the Opera House, and does all of its reconciling in between, in public, in the air.