does n't improve upon the experience of staring at a blank screen 
(ROOT (S (VP (VBZ does) (RB n't) (VP (VB improve) (PP (IN upon) (NP (NP (DT the) (NN experience)) (PP (IN of) (S (VP (VBG staring) (PP (IN at) (NP (DT a) (JJ blank) (NN screen))))))))))))
(ROOT (S (VP (VBZ ) (RB ) (VP (VB ) (PP (IN ) (NP (NP (DT ) (NN )) (PP (IN ) (S (VP (VBG ) (PP (IN ) (NP (DT ) (JJ ) (NN ))))))))))))