Haba Clever-Up! Building Block System 4.0Welcome to HABA's Clever Up! Building System. The cubes, rectangular blocks, panels and strips make it possible to build, bridge and create inclines and levels. The balls bring color and ideas into play. The triangular prism allows for more complex, integrated constructions roofs are also reinterpreted. Constructive and creative learning opens up a new universe of building blocks! Children also discover simple digital thinking. Clear, simple shapes