In 1906, Potter experimented with book formats for babies and very young children just acquiring verbal skills. One of the three books produced during this period was "The Story of Miss Moppet", a Victorian moral tale about teasing and its consequences with a kitten as the eponymous heroine. As the model for Miss Moppet, Potter borrowed a kitten from a mason working at Hill Top and wrote to Millie Warne, Norman Warne's sister, "I have borrowed a kitten and I am rather glad of the opportunity of working at the drawings. It is very young and pretty and a most fearful pickle." Tom Kitten himself would be created from the drawings Potter had produced during the production of "The Story of Miss Moppet".