The border between Spain and France was formally defined in the mid-seventeenth century with the signing of the Treaty of the Pyrenees on Pheasant Island, a document that put an end to a war between the two countries. In the 1970s, Ricardo Bofill Taller de Arquitectura (RBTA) was commissioned by the Société des Autoroutes du Sud de la France to design a project to break with the monotony of the motorway. Located at the Le Perthus border crossing on the Catalonia motorway, Bofill's pyramid stands between the two countries. Inspired by Inca temples, the 80-metre-high, reddish-coloured edifice stands on the debris of the earth removed for the construction of the road. As well as giving the landscape more heterogeneity, the architect wanted to pay homage to Catalonia. The four red stripes of the Catalan flag are represented at the top of the pyramid.