Subject ASC00009qv
Recreative Science.
1, Page 241 (1860)
Natural History Museum Library, London
BHL Page 2539510
Keywords
squares rectangles square rectangles color optics experiment Colour tint illusion shade artist colour stripe tint geometril figures gray surface light dark Square Squares Six rectangles Ten rectangles paper color theory series four shape rectangle six ten divided stripes gray scale optical illusions cards 2 squares Stripes