The curtain wall-a non-bearing wall attached to a building s structural frame like a curtain made of metal or, more likely glass-is an omnipresent feature of contemporary architecture. Variations of pattern and color, transparency and opacity offer the architect almost limitless design possibilities, a tremendous palette for skinning the structural frame of buildings from museums to skyscrapers.

The coupled cluster method represents one of the most successful and often used approaches to a quantum-theoretical determination of atomic, molecular, and solid state electronic structure and properties. These methods are relevant to a broad spectrum of disciplines ranging from astrophysics to pharmacology.