Oblong 32mo. (8)ff. An unusual, unused booklet with "magic leaves," which reveal a picture when lightly passed over with a pencil. For obvious reasons, it is especially rare to find such as this with a clean interior, and only one copy is currently listed in OCLC. The title, taken from the front cover, comes from a German children's folk song, the lyrics of which were written by Rudolf Löwenstein in the 19th century. Lowenstein was better known as a political writer and editor of the satirical newspaper Kladderadatsch, which briefly led to his exile from Prussia after the Revolution of 1848. Being of Jewish origin, Lowenstein's writings, including "Trara! Die Post is Da!", were frowned upon during the Nazi regime. Bound in pictorial wrappers featuring an old-fashioned horse and buggy and the caption "Schnellzeichner [Quick Sketch Artist]." Minor soiling to exterior, else fine.