To draw the facade of Lausanne, we have created a frame of wood with a grid of wool wires. After that we went to our site and put the frame vertically in front of the building. Throuth the frame we could observe and postpone the points to our sheet. When we looked up, the grid was smaller at the top of the building than at the bottom, because of the perspective. Indeed the espaces of the frame, which we draw prviously to our sheet, were regular. This allowed us to eliminate the deformation due to the perspective.
We built both molds layer by layer.