fischertechnik, a German construction kit is used for K-12 STEM & Robotics Education, industrial modelling and engineering courses wordwide. The basic building block can be built onto all six sides. The sets cover many topics incl. Mechanics, Statics, Electronics, Pneumatics, Hydraulics, Optics, Renewable Energies & Fuel Cell, Mechatronics, Robotics, PLC Control and Training Factory Industry 4.0. They  come with building instructions and tutorials as well as storage systems for everyday classroom use.