The Swiss architecture office Herzog & de Meuron does not need to be introduced. Their architecture is very unique and cannot be overlooked. Their most recently completed project is the Actelion business center in Allschwil, Switzerland. At first site it reminds us of the game tetris where the tetris volumes seem to be floating. This floating trick is created with big cantilevers from ferroconcrete and steel. The project provides 350 offices for employees of a pharmaceutical company while harboring an open and communicative work environment. Roofs are planted with grass or conceived as roof terraces. The building is absolutely transparent in all aspects. Ducts and piping were purposely avoided in the walls to limit communicative barriers. An important element are braces organized in k- and x-shapes. They are fully visible and so represent not only functional but also aesthetical value. While designing this building the environment has not been overlooked – the triple-glazed windows feature automatically adjusting louvers.