piece , a model of menacing atmosphere . 
(ROOT (NP (NP (NN piece)) (, ,) (NP (NP (DT a) (NN model)) (PP (IN of) (NP (JJ menacing) (NN atmosphere)))) (. .)))
(ROOT (NP (NP (NN )) (, ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (JJ ) (NN )))) (. )))