But later 'progress' may consist only in perfecting and refining skill already possessed. In actuality, Paige had been practicing and perfecting his curveball in secret for many years. Practice is clearly an important process for learning and perfecting a new skill. The nose drill bits are used for creating and perfecting the nostrils of the doll. This training places an emphasis on perfecting the marksmanship skills of the candidates. He has been perfecting the technique since the age of 13. Juveniles show high mortality shortly after leaving their mothers, while still perfecting their hunting techniques. Through a process of selective breeding, mankind is perfecting the perfectly average human being. His neurotic obsession with perfecting his physical appearance apparently knows no bounds. Artisans, such as engravers, became more concerned with aesthetics rather than just perfecting their craft. Scouts attending a summer camp work on Scout badges, advancement, and perfecting Scoutcraft skills. He's spent months perfecting an Irish accent. Machiavelli believes that a prince's main focus should be on perfecting the art of war. Ultimately, he abandoned working on a chair, and settled on perfecting a bed. For the role, he had to take lessons in perfecting an Indian-English accent.