It was about seven or eight feet tall.
( It ( ( was ( ( ( about ( ( seven or ) eight ) ) feet ) tall ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBD was) (ADJP (NP (QP (RB about) (CD seven) (CC or) (CD eight)) (NNS feet)) (JJ tall))) (. .)))
It was seven-and-a-half feet tall. 
( It ( ( was ( ( seven-and-a-half feet ) tall ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBD was) (ADJP (NP (CD seven-and-a-half) (NNS feet)) (JJ tall))) (. .)))