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STRUCTURAL DETAILING 153▲ 7.42 Refined roof truss detailing. ▲ 7.43 A post-tensioning node detail.▲ 7.44 School of Architecture, Marne-la-Vallée, Paris, France,Bernard Tschumi, 1999. Looking towards the main entrance.▲ 7.45 Unrefined steel beams pass over a work-space atop thelecture block inserted into the atrium.that reinforces the solid limestone masonry piers (Fig. 7.43). Speciallyselected aggregates for the concrete blocks housing the nodes matchthe colour of the surrounding stone blocks.The School of Architecture, Marne-la-Vallée, Paris, illustrates lessrefined detailing (Figs 7.44 and 7.45). An industrial quality pervades theall-concrete-and-steel exposed structure. Consider the four steelbeams that span an internal atrium, partially occupied by a box-likelecture theatre. Their unrefined cross-sections and longitudinal profilesraise questions such as why their shapes have not been better integratedwith the saw-tooth roof form? However, this beam detailingis consistent with the basic quality of exposed steelwork elsewherewhose galvanized surfaces are left unpainted. The standard of detailing