The glazed roof over the courtyard of the museum creates an extended exhibition space without impairing the view of the existing Renaissance building. Since glass can bear compression stresses better than tensile stresses, a shell construction seemed the appropriate form for this 37-metre-long roof. A special connecting shoe was developed to ensure an optimum transmission of loads between the individual panes of glass. The nodes between the panes are formed by four shoes secured by clamping plates. The structure is stabilized by diagonal cable stays fixed to the undersides of the nodes. The network of steel cables is tensioned via a web-like node construction and anchored to the existing structure and along the edges of the roof to a tubular eaves section.