Since the autumn of 2002, the courtyard areas of the newly designed museum district in Vienna have been enlivened with 114 abstract plastic blocks. The polygonal shape of these elements is the outcome of playing with various geometries, and the trapezoidal outer form allows the blocks to be lined up or assembled in many different combinations. In a computer-controlled cutting process similar to that used for making styrene models, the individual elements are shaped from 300 x 125 x 100 cm blocks of expanded polystyrene. The plastic core is then sprayed with a colour coating to protect it from ultraviolet radiation as well as wear and tear. As a form of maintenance, the surface coating is renewed every year in a different colour. Two bored openings reinforced with galvanized steel hollow sections allow a number of units to be joined together with steel cables or plastic straps to create a wide range of other forms. In view of the ample dimensions of these urban furnishings, the wind presents no problem. Nevertheless, they can be simply upturned, and the number of ways in which they can be repositioned is reflected by the variety of uses to which they are put.