a delightful stimulus for the optic nerves 
(ROOT (NP (NP (DT a) (JJ delightful) (NN stimulus)) (PP (IN for) (NP (DT the) (JJ optic) (NNS nerves)))))
(ROOT (NP (NP (DT ) (JJ ) (NN )) (PP (IN ) (NP (DT ) (JJ ) (NNS )))))