Tubular fixed slats on T4 Madrid-Barajas Airport 
This building in Madrid, as CosmoCaixa in the same city, seeks the lightness of the supporting structures of the glass. In this case it is solved with stretchers and crosspieces holding glasses directly. An ethylene-propylene element joins the glasses among them as a gasket. To prevent the system from being deformed by the action of wind, the outside stretcher is prestressed to 60t, so that even in case of strong winds it never gets compressive load.