a fascinating curiosity piece -- fascinating , that is , 
(ROOT (NP (NP (DT a) (JJ fascinating) (NN curiosity) (NN piece)) (, --) (ADJP (JJ fascinating) (PRN (, ,) (S (NP (DT that)) (VP (VBZ is))))) (, ,)))
(ROOT (NP (NP (DT ) (JJ ) (NN ) (NN )) (, ) (ADJP (JJ ) (PRN (, ) (S (NP (DT )) (VP (VBZ ))))) (, )))