engaging as it is revealing 
(ROOT (S (VP (VBG engaging) (SBAR (IN as) (S (NP (PRP it)) (VP (VBZ is) (VP (VBG revealing))))))))
(ROOT (S (VP (VBG ) (SBAR (IN ) (S (NP (PRP )) (VP (VBZ ) (VP (VBG ))))))))