000  $anz n  2
000  $a주제어
001  $aKSH1999017964
005  $a19990601150227
008  $a990601 n azknnaabn          |a a|a    | 
150  $a기하학적 착시[幾何學的錯視]
450  $wr$i영어$ageometrical optical illusions
550  $wg$a착시[錯視]