According to Princess Galyani Vadhana's book, "Busy Fingers", the princess mother had always shown an interest in astronomy. "When she was in the States she had a copy of "Astronomy for Beginners". Later on when her youngest son started astronomy lessons at his Lausanne school, Mother bought him a copy of "Le Ciel" (The Sky), Larousse edition. In this book there were some maps of stars and the Moon which she looked up so often that three pages fell out. These Mother took out eventually for separate use".