is astounding on any number of levels 
(ROOT (VP (VBZ is) (ADJP (JJ astounding)) (PP (IN on) (NP (NP (DT any) (NN number)) (PP (IN of) (NP (NNS levels)))))))
(ROOT (VP (VBZ ) (ADJP (JJ )) (PP (IN ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (NNS )))))))