    To the best of our recollection, this may be the only instance in which the origin of an expression has been traced to a statue.
( ( To ( ( the best ) ( of ( our recollection ) ) ) ) ( , ( this ( ( may ( be ( ( the ( only instance ) ) ( ( in which ) ( ( ( the origin ) ( of ( an expression ) ) ) ( has ( been ( traced ( to ( a statue ) ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (TO To) (NP (NP (DT the) (JJS best)) (PP (IN of) (NP (PRP$ our) (NN recollection))))) (, ,) (NP (DT this)) (VP (MD may) (VP (VB be) (NP (NP (DT the) (JJ only) (NN instance)) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (NP (NP (DT the) (NN origin)) (PP (IN of) (NP (DT an) (NN expression)))) (VP (VBZ has) (VP (VBN been) (VP (VBN traced) (PP (TO to) (NP (DT a) (NN statue))))))))))) (. .)))
Thousands of expressions owe their origins to statues. 
( ( Thousands ( of expressions ) ) ( ( ( owe ( their origins ) ) ( to statues ) ) . ) )
(ROOT (S (NP (NP (NNS Thousands)) (PP (IN of) (NP (NNS expressions)))) (VP (VBP owe) (NP (PRP$ their) (NNS origins)) (PP (TO to) (NP (NNS statues)))) (. .)))