Sculpture by Currey and Company from the Ferdinand Bull collection in Graphite finish The Ferdinand Bull sculpture is made from a lost-wax technique when boiling aluminum is poured into a mold covering an original wax sculpture that melts away. Once set, there is a very long process of refining the metal to give it patina. This black sculpture is large in scale so it will be a statement piece in a space. Not only does the flowing shape of the bull's body and the whimsical angling of the horns make this a special accessory, the fact that the surface has a light texture does as well.