We discover Plattenbau, an homage to the space concept of early Bauhaus and a learning tool which serves the comprehension of complex relativities. Plattenbau is a cube assembled from 25 softly polished fine wood components. It is both a learning element and a toy at the same time. Its individual components can be assembled and combined in all different ways. Due to the haptic and intelligent construction of ever new forms, not only the perception of space qualities and the orientation in space are trained, but also the skills in abstract and strategic thinking. Love it, so simple so clever!