The unusual design by Neutelings Riedijk Architects consists of a stack of 10 concrete boxes each rotated a quarter turn relative to the others. The space outside the box functions as a public gallery which offers an unusual and ever-changing view of Antwerp and leads to a restaurant on the roof. The commission specified that columns or other structural elements must not obstruct the view or detract from the illusion of the floating boxes. The curved glass, provided by Sunglass Italy, was perfectly suited for this goal.