Liao Dynasty. The weave structure is typical Liao samite, but the design retains the influence commonly found in the Tang dynasty. The pattern consists of pearl roundels enclosing four birds in symmetrical arrangement. This is a combination of a Song dynasty grid system popularly known as cu si (group of four in tangential arrangement) and a Central Asian motif of the bird in roundel. The use of pearl roundels is also popular in Liao textiles. China National Silk Museum.