The creation of a new object comes out of the interaction of rules and freedom as in a board game. The first step is fixing the rules:the achievement of a technologic-functional objective together with the recovery of a design theme. Then, within these rules there is the field of freedom, of invention and strategies. This game gives to the designer the project. Then comes the hardest part of the work. It will be a long period devoted to correct the defects and to improve, by trial and error, to make the project a perfectly functional and reliable product.