Avante-Garde Trees Visit the annual exhibition of Christmas trees created by top couturiers and designers at the Centre Pompidou. The ``trees'' don't look much like your standard evergreen; they're Christmas concoctions with something vaguely tree-like about them. Creations are by turns wickedly funny, seductive, political, lovely, and just plain weird. It's a fun exhibit, and your entrance fee goes to a French charity that assists orphaned children.