8. After Mas has finished sketching, he makes a model using polystyrene covered with plaster. With this he can easily modify the design, carving it or building it up until he is satisfied. Sometimes he will paint the model in a dark color so he better visualize the finished work (not shown in this picture). If he decides he likes it, then he makes marks that will allow him to copy the model in wood. In particular, note the straight line marked across the stone - when the stone is seated correctly that line is level.