Platonische Koerper, is platonic solid in Germen. They are trihedron, hexahedron, octahedron, dodecahedron and icosahedron. They greatly inspired me in design. Different application of golden section on hexahedron to get the other four objects is an endless study and exploring process. Following are models I used in my courses in Cheung Kong School of Art & Design (CKAD). They are cores of product design education. They are also with my great appreciation to my Professor in Bremen University of Arts, Prof. Oliver Niewiadomski.