municipality of rotterdam wishes to project a manned safety monitoring booth for a puber playground in a park, brief explicitly states the appreciated consideration of sustainability of building, playground with its apparatus is a place where playing energy concentrates and acted out, instead of lost of this calorie burning physical energy, the apparatus with its moveable and immobile resistant components receiving forces and pressure by the activity of play can act like transformator of energy and establish a transfer in type of energy so harvest this energy, with output in generic applicable electric energy ...