The magical, colorful story of Mary Poppins—the stern yet ethereal nanny, friend to every screever, constellation, and animal—has its origins in, of all places, the serious confines of a bank. Mary Poppins book series author, P.L. Travers, was born Helen Lyndon Goff in Maryborough, Queensland, on August 9, 1899, in the top floor apartment of the Australian Joint Stock Bank managed by her father, Travers Goff. Goff had always been a dreamer and a storyteller himself. A child at heart, he was ill-equipped for the corporate world, shirking his responsibilities and preferring…