Although a commercial marbler is usually required to repeat patterns, every sheet of hand-marbled paper he or she makes is a monoprint, a one-off. a  A few exceptionally talented marblers are now presenting their papers as pieces of art. Renato Crepaldi (b 1973) produces a limited edition of each pattern, and signs and dates his work. This is his Cobalt Blue and Chromium Oxide Green Fern with his signature inclusion of metallic accents. Shepherds in London is a trove of decorated papers, including a small number by Crepaldi.