This article is part of our new "Material Focus" series, which asks architects to elaborate on the thought process behind their material choices and sheds light on the steps required to get buildings actually built.

In the Catalan countryside, on the outskirts of the small town of Alforja, sits an incongruous sight: among the scattered stone masia houses is a structure of steel and glass, a resolutely rectilinear box among the traditional housing forms. But once inside the OE House, designed by Fake Industries Architectural Agonism and Aixopluc, one realizes that the building is not so different to its neighbors after all: on the upper floor, the roof incorporates a system of ceramic vaults taken almost directly from traditional vernacular design. This feature then combines with plywood and OSB to create a truly eclectic material pallette. We spoke with the design's architects, David Tapias of Aixopluc and Cristina Goberna and Urtzi Grau of Fake Industries Architectural Agonism, to find out what lay behind these unusual material choices.