( ( below it ) ( ( is ( a ( yellow ( filter ( layer ( to ( block ( blue light ) ) ) ) ) ) ) ) ; ) )
(ROOT (S (NP (RB below) (PRP it)) (VP (VBZ is) (NP (DT a) (JJ yellow) (NN filter) (NN layer) (S (VP (TO to) (VP (VB block) (NP (JJ blue) (NN light))))))) (: ;)))
below it is a yellow filter layer to block blue light;
(ROOT (S (NP (DT A) (JJ blue) (NN block)) (VP (VBZ appears) (ADJP (JJ blue) (PP (IN in) (NP (DT the) (NN sunlight)))) (SBAR (IN if) (S (NP (RB only) (JJ blue) (NN light)) (VP (VBZ is) (VP (VBN reflected) (PP (IN by) (NP (DT the) (NN block)))))))) (. .)))