The striking lozenge-shaped glass panels that make up the facade of the Prada building are varyingly concave, convex and flat in curvature, resulting in ever-changing visual impressions as you move around the interior or exterior. The building occupies only a small portion of its site, leaving room for an open plaza-like space in front. Completed in 2003, it is the work of the Swiss architectural firm of Herzog & de Meuron.