A miniature book is a very small book. Standards for what may be termed a miniature rather than just a small book have changed through time. Today, most collectors consider a book to be miniature only if it is 3 inches or smaller in height, width, and thickness, particularly in the United States. Many collectors consider nineteenth-century and earlier books of 4 inches to fit in the category of miniatures. Book from 3–4 inches in all dimensions are termed macrominiature books. Books less than 1 inch in all dimensions are called microminiature books. Books less than 1/4 inch in all dimensions are known as ultra-microminiature books. History Miniature books stretch back far in history; many collections contain cuneiform tablets stretching back thousands of years, and exquisite medieval Books of Hours. Printers began testing the limits of size not long after the technology of printing began, and around 200 miniature books were printed in the sixteenth century. Exquisite specimens from the 17th century abound. In the 19th century, technological innovations in printing enabled the creation of smaller and smaller type. Fine and popular additions alike grew in number throughout the 19th century in what was considered the golden age for miniature books. While some miniature books are objects of high craft, bound in fine Moroccan leather, with gilt decoration and excellent examples of woodcuts, etchings, and watermarks, others are cheap, disposable, sometimes highly functional items not expected to survive. Today, miniature books are produced both as fine works of craft and as commercial products found in chain bookstores. Miniature books were produced for personal convenience. Miniature books could be easily be carried in the pocket of a waistcoat or a woman's reticule. Victorian women used miniature etiquette books to subtly ascertain information on polite behavior in society. Along with etiquette books, Victorian women that had copies of The Little Flirt learned to attract men by using items already in their possession, such as, gloves, handkerchiefs, a fan and parasol. In 1922, miniature books regained popularity when 200 postage stamp sized books were created to be displayed in the miniature library of Queen Mary's miniature doll house. Princess Marie Louise, a relative of Queen Mary also requested that living authors contribute to the existing dollhouse library. Following in Queen Mary footsteps, many miniature book collectors begin collecting miniatures for their dollhouse libraries. A miniature book has even been to the moon. In