00418nam a2200121 a 450000500170000000800410001724500930005826000650015130000180021665000220023465000290025685200110028520190520020417.0070910s19uu    xx            00    eng d10aOptical illusions :billusions and curiosities, the incomprehensible and the impossible.0 aHong Kong :bReader's Didgest Association Fear East,cc1984.  a48 p. : figs.  aOptical illusions  aCuriosities and wonders.  7OLOPSC