The process started with the architect's or designer's sketches and drawings; sculptors created original models in the factory, usually of clay and sized about 14% larger than the final product to allow for shrinkage. The architects approved the models or suggested changes to them. Once the model was approved, plaster piece molds were made of the clay models. At this point, in order to create many identical multiples, additional molds were made of the model or of the first plaster piece mold.