On Closed-Shell Interactions, Polar Covalences, d Shell Holes, and Direct Images of Orbitals: The Case of Cuprite Discussions with Professors and Doctors G. von Bünau, B. Engelen, H. D. Lutz, J. Niu-Schwarz, and A. Pfitzner (Siegen, Germany), R. Hoffmann (Ithaka, NY, USA), C. J. Humphreys (Cambridge, UK), A. Kirfel (Bonn, Germany), T. Lippman and J. Schneider (Hamburg, Germany), K. Schwarz (Vienna, Austria), M. Spackman (Armidale, Australia), J. C. H. Spence, M. O'Keefe and J. M. Zuo (Tempe AZ, USA), and financial support by Deutsche Forschungsgemeinschaft (DFG) and by Fonds der Chemischen Industrie (FCI) are all gratefully acknowledged.