Imaginative play, Vygotsky noted, also functions as a bridge from the concrete thought of the preschool and early school years to mature  adult thought, which can be totally free of real situations. 
( ( Imaginative play ) ( ( , ( Vygotsky ( noted , ) ) ) ( ( also ( ( functions ( as ( ( a bridge ) ( from ( ( the ( concrete thought ) ) ( of ( the ( preschool ( and ( early ( school years ) ) ) ) ) ) ) ) ) ) ) ( to ( mature ( ( ( adult thought ) , ) ( which ( can ( be ( totally ( free ( of ( real situations ) ) ) ) ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (NP (JJ Imaginative) (NN play)) (PRN (, ,) (NP (NNP Vygotsky)) (VP (VBD noted)) (, ,)) (VP (ADVP (RB also)) (VBZ functions) (PP (IN as) (NP (NP (DT a) (NN bridge)) (PP (IN from) (NP (NP (DT the) (JJ concrete) (NN thought)) (PP (IN of) (NP (DT the) (JJ preschool) (CC and) (JJ early) (NN school) (NNS years))))))) (S (VP (TO to) (VP (VB mature) (NP (NP (JJ adult) (NN thought)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (MD can) (VP (VB be) (ADJP (RB totally) (JJ free) (PP (IN of) (NP (JJ real) (NNS situations))))))))))))) (. .)))
Vygotsky noted that there is no bridge between concrete thought and mature adult thought.
( Vygotsky ( ( ( ( noted ( that ( there ( is ( ( no bridge ) ( between ( concrete thought ) ) ) ) ) ) ) and ) ( mature ( adult thought ) ) ) . ) )
(ROOT (S (NP (NNP Vygotsky)) (VP (VP (VBD noted) (SBAR (IN that) (S (NP (EX there)) (VP (VBZ is) (NP (NP (DT no) (NN bridge)) (PP (IN between) (NP (JJ concrete) (NN thought)))))))) (CC and) (VP (VBP mature) (NP (JJ adult) (NN thought)))) (. .)))