Toyota introduced the karakuri philosphy as part of the Toyota Production System (TPS). Carts, racks, roller conveyors, etc. with which material is handled on the basis of gravity, levers, cams and inertia. This to move boxes and parts between machines or deliver a controlled number of small parts to the hands of an operator. Karakuri allows Toyota and in the meanwhile several other companies to involve the operators even more in the kaizen activities and to let them implement cheap automation projects.