'  Perhaps it was so called because it opens in morning and closes at night, or because of its eyelike shape.
( ' ( ( Perhaps it ) ( ( ( was so ) ( called ( because ( it ( ( ( opens ( in morning ) ) and ) ( closes ( ( ( ( ( at night ) , ) or ) because ) ( of ( its ( eyelike shape ) ) ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S ('' ') (NP (RB Perhaps) (PRP it)) (VP (VBD was) (ADVP (RB so)) (VP (VBN called) (SBAR (IN because) (S (NP (PRP it)) (VP (VP (VBZ opens) (PP (IN in) (NP (NN morning)))) (CC and) (VP (VBZ closes) (PP (PP (IN at) (NP (NN night))) (, ,) (CC or) (RB because) (PP (IN of) (NP (PRP$ its) (JJ eyelike) (NN shape)))))))))) (. .)))
It may have been called so because of its opening and closing rituals, or because it resembles an eye.
( It ( ( may ( have ( been ( ( called so ) ( ( because ( of ( its ( opening ( and ( closing rituals ) ) ) ) ) ) ( , ( or ( because ( it ( resembles ( an eye ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (MD may) (VP (VB have) (VP (VBN been) (VP (VBN called) (ADVP (RB so)) (UCP (PP (RB because) (IN of) (NP (PRP$ its) (NN opening) (CC and) (NN closing) (NNS rituals))) (, ,) (CC or) (SBAR (IN because) (S (NP (PRP it)) (VP (VBZ resembles) (NP (DT an) (NN eye)))))))))) (. .)))