In 1943, Ray started work at D. J. Keymer, a British-run advertising agency, as a "junior visualiser," earning eighty rupees a month. Although he liked visual design (graphic design) and he was mostly treated well, there was tension between the British and Indian employees of the firm. The British were better paid, and Ray felt that "the clients were generally stupid. " Later, Ray also worked for Signet Press, a new publishing house started by D. K. Gupta. Gupta asked Ray to create cover designs for books to be published by Signet Press and gave him complete artistic freedom. Ray designed covers for many books, including Jibanananda Das's Banalata Sen, and Rupasi Bangla, Bibhutibhushan Bandyopadhyay's Chander Pahar, Jim Corbett's Maneaters of Kumaon, and Jawaharlal Nehru's Discovery of India. He worked on a children's version of Pather Panchali, a classic Bengali novel by Bibhutibhushan Bandyopadhyay, renamed as Aam Antir Bhepu (The mango-seed whistle). Designing the cover and illustrating the book, Ray was deeply influenced by the work. He used it as the subject of his first film, and featured his illustrations as shots in his ground-breaking film.