catching solely on its visual merits 
(ROOT (S (VP (VBG catching) (PP (ADVP (RB solely)) (IN on) (NP (PRP$ its) (JJ visual) (NNS merits))))))
(ROOT (S (VP (VBG ) (PP (ADVP (RB )) (IN ) (NP (PRP$ ) (JJ ) (NNS ))))))