a buoyant , expressive flow of images 
(ROOT (NP (NP (DT a) (JJ buoyant) (, ,) (JJ expressive) (NN flow)) (PP (IN of) (NP (NNS images)))))
(ROOT (NP (NP (DT ) (JJ ) (, ) (JJ ) (NN )) (PP (IN ) (NP (NNS )))))