A novel polyethylene is devised which polyethylene is particularyl advantageous for manufacturing rotomoulded articles. The first step of the method is to provide a front glass substrate having a pixel area and a bonding area. The machines further include a reaction system adapted to cause a predetermined action to take place upon detection of contact between the person and the cutter by the contact detection system. The correction monitor is operative to monitor correction events and to provide an indication that an event has occurred.