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A steel floor platform, made up of perforated metal decking over lightweight structural steel, provides a base for the pavilion at the same level as the Serpentine Gallery floor. The 30m-diameter balloon sits on a 5m-high polycarbonate drum, made up of two circular walls of polycarbonate panels, 1.6m apart. The café and all the infrastructure and services sit within the void of the wall, which is made up of 55 segments. A bespoke polycarbonate mullion assembly, located at approximately ...

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