It sounds like a question for “Dear Abby”: how can the Spanish architects José Selgas and Lucia Cano reconcile their passion for nature with these crazy retro-’60s sci-fi plastic spaceships they love to build? In their auditorium and congress center for the ancient city of Plasencia in western Spain, their design took off from the premise of refusing to fill or urbanize the site—a steep hillside—opting instead to preserve its arid, rocky landscape dotted with wild mountain shrubs. Their building occupies the parcel as lightly as possible, with the sloping volume that holds the auditorium seating cantilevered off the ground. Originating with a 2005 competition, but completed only this year due to financing problems, the congress center is perched just beyond the city’s edge, standing out in its harsh habitat as an exotic, multifaceted boulder sheathed in pale, translucent panels of ETFE. Like a moated castle, it has a gangway entry, which is announced by its brilliant orange hue, and leads to a monumental, color-saturated entry porch. This space passes right through the building to a lookout on the other side that offers views toward the Sierra de Gata mountains.
The natural terrain lies 57 feet below the artificial grade of the roadway, Cano points out, so the challenge was “how to raise the building to street level,” a trick the team accomplished by locating the entry portal on top of the auditorium. From there, stairs and ramps feed down the building’s sides, between the ETFE and the concrete structure, to access the building. A smaller hall, meeting rooms, and an exhibition space pile up over the main hall, enabling the fly tower to be fully incorporated in the volume. The ETFE functions “like a raincoat” in Plasencia’s relatively mild climate, Cano explains, and the perimeter ramps are open to views and weather at several points.
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