I want to test the ability of students to read a passage and answer questions about it. Could you please come up with a good question for the passage "One of the earliest surviving examples of European quilting, the late 14th-century Sicilian Tristan Quilt, is also held by the collection. The collection has numerous examples of various types of textiles designed by William Morris, including, embroidery, woven fabrics, tapestries (Including 'The Forest' tapestry of 1887), rugs and carpets, as well as pattern books and paper designs. The art deco period is covered by rugs and fabrics designed by Marion Dorn. From the same period there is a rug designed by Serge Chermayeff."? 

Which designer is responsible for one art deco rug?