it 's a rare window on an artistic collaboration . 
(ROOT (S (NP (PRP it)) (VP (VBZ 's) (NP (NP (DT a) (JJ rare) (NN window)) (PP (IN on) (NP (DT an) (JJ artistic) (NN collaboration))))) (. .)))
(ROOT (S (NP (PRP )) (VP (VBZ ) (NP (NP (DT ) (JJ ) (NN )) (PP (IN ) (NP (DT ) (JJ ) (NN ))))) (. )))