like a wet burlap sack of gloom 
(ROOT (PP (IN like) (NP (NP (DT a) (JJ wet) (NN burlap) (NN sack)) (PP (IN of) (NP (NN gloom))))))
(ROOT (PP (IN ) (NP (NP (DT ) (JJ ) (NN ) (NN )) (PP (IN ) (NP (NN ))))))