just the labor involved in creating the layered richness of the imagery in this chiaroscuro of madness and light 
(ROOT (NP (NP (RB just) (DT the) (NN labor)) (VP (VBN involved) (PP (IN in) (S (VP (VBG creating) (NP (NP (DT the) (VBN layered) (NN richness)) (PP (IN of) (NP (DT the) (NN imagery)))) (PP (IN in) (NP (NP (DT this) (NN chiaroscuro)) (PP (IN of) (NP (NN madness) (CC and) (NN light)))))))))))
(ROOT (NP (NP (RB ) (DT ) (NN )) (VP (VBN ) (PP (IN ) (S (VP (VBG ) (NP (NP (DT ) (VBN ) (NN )) (PP (IN ) (NP (DT ) (NN )))) (PP (IN ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (NN ) (CC ) (NN )))))))))))