to the grayish quality of its lighting 
(ROOT (PP (IN to) (NP (NP (DT the) (JJ grayish) (NN quality)) (PP (IN of) (NP (PRP$ its) (NN lighting))))))
(ROOT (PP (IN ) (NP (NP (DT ) (JJ ) (NN )) (PP (IN ) (NP (PRP$ ) (NN ))))))