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62 STRUCTURE AS ARCHITECTURE▲ 4.18 Centre Pompidou, Paris, France, Piano and Rogers, 1977. Screening effect ofstructure on the main façade.▲ 4.19 Mexican Embassy, Berlin, Germany, González de León and Serrano, 2000.Dynamic columned-walls.their light colour create a fine mesh-like screen that lessens the visualimpact of the exposed columns and wall cladding behind it. From a functionalperspective, the horizontal separation of the screen from theenvelope provides width for circulation routes along the front façade,and space for exposed services at the rear.The main façade of the Mexican Embassy, Berlin, is the final example ofexterior structure functioning as a screen (Fig. 4.19). Forty closelyspaced and over-structured concrete mullions-cum-columns, necessitatedby neither gravity nor wind loads, satisfy security and aestheticrequirements. By virtue of their depth and close spacing the columns