This work by Mario Ceroli is valuable and of rare workmanship. It develops on two levels and represents a head seen in profile. The head in the foreground is partially hinged so if we look at the work in the first instance the head below appears to be incomplete, while if we open the hinges the head below appears in its entirety. With this trick Ceroli obtains two figures, the upper one darker than the lower one and where ash abounds, the lower one is lighter than the upper one with little ash and predominance of lime. Both versions are given on this web page