For most people, getting into the world of addition and subtraction is anything but easy. At first, the abstract world of the numbers appears to be enigmatic and incomprehensible. With...
Everything's turning, everything's moving. The direction is determined by the child and if everything is arranged correctly, then everything actually happens as planned. The shifting and driving of cogwheels has...
Assembling the colourful wooden cogwheels on the tableau is only half the fun. Only when the big blue wheel is cranked does it become clear whether the plan has worked...