This article from the WGBH program Sister Wendy: "American Collection" discusses Queen Isabella the Catholic's prayerbook, called the Book of Hours. The book was created by the artists of the Ghent-Bruges School and given to Queen Isabella by a subject. Each illustration is a mini painting, embellished in gold, of a biblical scene. The prayerbook is important because it is portable and has lasted much longer than larger religious works of art. The Cleveland Museum of Art, Ghent, Flemish, c. 1497-1500.