We kindly ask you to accept our apologies if the translations of some paragraphs do not exactly match their German counterparts. Given the nature and structure of the English language, it was necessary for the translators (Julian Black, Lesley Bollinger, Angelika Kirchmeyer, Ursula Schickling, Stewart Spencer, Monika Stark) and revisers to change the flow of the text, and to cut and rephrase sentences and content in the English version of this catalog. Their style is reflected in their translations and editorial reviews and thus there is a certain lack of consistency throughout the translation. However, since every chapter is a self-contained unit this should not affect working with this catalog. In case of ambiguities over terminology please refer to the German original text. Thank you!