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STRUCTURAL DETAILING 155▲ 7.48 Millennium Seed Bank, Wakehurst Place, Sussex,England, Stanton Williams, 2000. Barrel-vaulted roof forms.▲ 7.49Detailing matches the simple structural forms.▲ 7.50Grand Louvre, Paris, France, I. M. Pei, 1989. Visually confusing structure.transparency has led to structural complexity. Rather than frame thepyramid conventionally with solid sloping rafters spanning between thebase and the four ridges of the pyramid, the architect opted for a diagonallyorientated system – a two-way grillage of stressed cable-beams.While small diameter stainless-steel members offer a high degree oftransparency, from many viewing angles the profusion of rods and connectionsis visually confusing (Fig. 7.50). Visual complexity arises primarilydue to the large number of individual members, even though eachis small.