The Spiral vaults into new space. Inside is outside. Floors are denied columns and walls offer no shortcuts for gravity. Structure and architecture become one immediacy. A new kind of tiling, a fractal – the basis of Balmond’s piece Fractile designed for the extension – breaks the surface up all over in a mathematical mosaic, revealing a complexity that is born out of deep simplicity; only three tile shapes produce an endless articulation around the form, an ancient code. TheSpiral’s walls act as a wrapping, laid out as a strip, placed on the tiled pattern, which climbs as it also fold, with no roof. It is finite but unbounded.