Flach-, Mittel- oder Hochbau? Nearly a century later, the question raised by Gropius at the 1930 CIAM congress in Brussels can hardly be considered settled, at least in Europe and certainly not in Switzerland. Here, unlike elsewhere on the continent, high-rise buildings never developed into a continuous tradition. […] Recent population growth and land scarcity have reopened a still-contentious question: how can building density be increased while delivering high-quality architecture and preserving the existing heritage, whether built or natural?