THE juicy looking grapes hanging on a large trellis are the first things that catch your eyes when entering the Grape Chang Exhibition Hall of the Huashi Community Museum in Beijing.They seem plump and ripe,and ready to eat—but hang on;these are not real grapes.After close scrutiny,the observer realizes that the tantalizing fruit is actually made of glass.Chang Hong,the fifth-generation inheritor of Grape Chang,is familiar with the looks of disbelief from visitors.In many exhibitions she has observed almost everyone who sees the grapes wanting to touch or even taste them.