TO most people,an eggshell is something that gets tossed into the garbage can.But to Zhao Wei,the inheritor of the intangible cultural heritage of eggshell painting,it provides a canvas on which to create mini-masterpieces.Over the years,with innovative ideas and exquisite craftsmanship,Zhao has resurrected the ancient art of eggshell painting and developed a growing following.Painted eggshells,or caidan,which literally means colored eggshells,are a traditional folk handicraft in Beijing.Folk artists use brushes,pens,knives or needles to draw,carve or sew all kinds of patterns on the outside of empty eggshells of chicken,ducks,geese,snakes,pigeons or ostriches.