the experience of staring at a blank screen 
(ROOT (NP (NP (DT the) (NN experience)) (PP (IN of) (S (VP (VBG staring) (PP (IN at) (NP (DT a) (JJ blank) (NN screen))))))))
(ROOT (NP (NP (DT ) (NN )) (PP (IN ) (S (VP (VBG ) (PP (IN ) (NP (DT ) (JJ ) (NN ))))))))