BINDINGS - MAC-NAB Maurice. Poèmes mobiles, monologues. Poèmes Incongrus, suite aux Poèmes Mobiles, contenant ses nouveaux monologues et dernières chansons, avec une préface de Voltaire. Paris, Léon Vanier, 1889-1891; 2 works bound in contemporary style spine to spine, with a single lower board binding them, in-12 of 63-[1] pp. ; xii-142 pp., red half-percaline and green half-percaline, smooth spines, gilt titles throughout, first covers. First edition for the first title and second edition for the second. The two main works of the famous chansonnier, with illustrations by the author and a preface by Coquelin Cadet in the Poèmes mobiles. Rare twin bindings; known since the 16th century, back-to-back bindings were very fashionable in the 17th and 18th centuries. "Was it to achieve a lighter effect or to do something strange that this object was designed? I lean towards the second hypothesis; in short, the handling of the book is not practical, but it is a curiosity that is not common to encounter". (Léon Gruel, La Reliure et la dorure des livres).