▁character ▁who ▁lives ▁in ▁a ▁small ▁room , ▁based ▁on ▁its ▁description ▁significantly ▁larger ▁than ▁a ▁standard ▁guard house , ▁in ▁the ▁wall ▁that ▁surr ounds ▁the ▁Emer ald ▁City . ▁In ▁The ▁Wonder ful ▁W izard ▁of ▁O z ▁( 1 9 0 0 ) ▁and ▁The ▁Marvel ous ▁Land ▁of ▁O z ▁( 1 9 0 4 ), ▁his ▁job ▁is ▁to ▁ad orn ▁green ▁spect acle ▁glass es ▁around ▁the ▁heads ▁of ▁all ▁visitors ▁to ▁the ▁Emer ald ▁City ▁before ▁they ▁enter . ▁This ▁is ▁done ▁to ▁protect ▁their ▁eyes ▁from ▁the ▁thousands ▁of ▁gl itter ing ▁green ▁g ems ▁within ▁the ▁city ▁that ▁are ▁so ▁pre cious ▁and ▁rare , ▁they ▁would ▁cause ▁blind ness ▁without ▁the ▁spect acles . ▁The ▁glass es ▁can ▁only ▁be ▁un locked ▁by ▁a ▁solid ▁gold ▁key ▁that ▁the ▁Guardian ▁always ▁we ars ▁on ▁a ▁thick ▁gold ▁chain ▁around ▁his ▁neck . ▁ ▁After ▁The ▁Marvel ous ▁Land ▁of ▁O z ▁he ▁abandoned ▁the ▁practice , ▁for ▁General ▁Jin j ur ' s ▁Army ▁of ▁Revol t ▁and ▁Ti ppet arius ▁had ▁all ▁entered ▁the ▁city ▁without ▁damage ▁to ▁their ▁eyes . ▁The ▁spect acles ▁were ▁the ▁idea ▁of ▁the ▁W izard ▁of ▁O z ▁to ▁make ▁the ▁city ▁appear ▁gre ener ▁than ▁it ▁actually ▁is . ▁The ▁Guardian ▁of ▁the ▁G ates ▁appears ▁only ▁occasionally ▁after ▁this ▁book , ▁and ▁his ▁duty ▁becomes ▁significantly ▁l ighter . ▁ ▁In ▁The ▁P atch work ▁Girl ▁of ▁O z ▁( 1 9 1 3