Visual Illusions, by Matthew
   Luckiesh����������������������������������� 36297
   � [Subtitle: Their Causes, Characteristics and Applications]
   � [Link: [1]http://www.gutenberg.org/3/6/2/9/36297 ]
   � [Files: 36297.txt; 36297-8.txt; 36297-h.htm]
   Thanks to Bryan Ness and the Online Distributed
   Proofreading Team at [2]http://www.pgdp.net (This file was
   produced from images generously made available by The
   Internet Archive.)
   Many thanks
   Janet

References

   1. http://www.gutenberg.org/3/6/2/9/36297
   2. http://www.pgdp.net/