is a sobering meditation on why we take pictures 
(ROOT (VP (VBZ is) (NP (NP (DT a) (JJ sobering) (NN meditation)) (PP (IN on) (SBAR (WHADVP (WRB why)) (S (NP (PRP we)) (VP (VBP take) (NP (NNS pictures)))))))))
(ROOT (VP (VBZ ) (NP (NP (DT ) (JJ ) (NN )) (PP (IN ) (SBAR (WHADVP (WRB )) (S (NP (PRP )) (VP (VBP ) (NP (NNS )))))))))