Against the backdrop of a large red-and-black mosaic, the architect draws a wavy line resting on a series of thin little legs: a shelter above an existing 50-m-long grandstand. The drawing is graceful and simple; the design calls for the most literal possible translation into reality.A 15-mm-thick steel sheet and 45 round-steel supports with a diameter of 55 mm are arranged more or less randomly on the three tiers of the grandstand. The curve, which increases the stiffness of the steel plate, was optimized to prevent buckling caused by the thrust forces in the roof plate. The steel plates were curved in the workshop and, in ten five-meter pieces, were invisibly joined on site using countersunk bolts in overlapping edges at half-thickness. For attaching the roof to the legs, a single bolt was screwed each time from above through the steel plate into the axis of the column. The columns must support the plate vertically while also acting as horizontal bracing. Since the 15 columns in the front row lie approximately at the midpoint of the 5-m-wide canopy, they bear nearly all the weight. The columns in the rear rows, which carry only a small share of the load, react most rigidly to horizontal forces and therefore act as bracing elements. Bracing columns, in this type of structure, are penalized by a doubling of the buckling length. All columns are thus used almost optimally. The short columns must be calculated with a large buckling length but fortunately carry only a small load. The long columns are heavily loaded but less prone to buckling.