Our artificers imitate their masters, or their antecessors. It is human to evade operose labor of body or mind. Labor of mind facilitly may be evaded by imitation: for, so, sollicitude of mind conducive to invention becomes supervacuous. Hence, artificers of a negligent nature follow traditions and canons of the schools. How many have intended themselves to imitate the inaccessible Messer Alessandro Filipepi?