Play becomes more and more complex as we get older.  Adolescents, like adults, want to put their
own signature on whatever they do, so if you give them the raw materials to make something 
specific, don't be surprised if they go another way completely!  This is their time to really express
themselves as individuals.  Encourage them in whatever they enjoy.  And a note to adults:  Keep 
playing!  You can have a vacation every day . . . when you play!