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STRUCTURE AND LIGHT 181▲ 8.27 Stair treads connect to the glass wall. ▲ 8.28 City of Arts and Sciences, Valencia, Spain, SantiagoCalatrava, 1998. L’Umbracle with its garden shade-structure.▲ 8.29Shade-structure arches and ribs.Roof structure within the Wohlen High School auditorium also plays astrong light-filtering role (see Figs 6.18 and 6.19). Daylight enters thehall through clerestory windows above the interior structure. Theclosely spaced ribs that radiate from the primary arches act as light filters.A white-stained finish increases the timber’s reflectance underboth natural and artificial lighting conditions.Santiago Calatrava’s fascination with ribbed structures also findsexpression in an exterior structure known as L’Umbracle, in the City ofArts and Sciences precinct, Valencia (Figs 8.28 and 8.29). As well as