Bonnetmaker 11:29pm, 6 February 2012
Manipolating images e.g. with GIMP today could show, how artists in earlier times have manipulated (in their mind or by using sketches or ...) images in the past in order to construct pictorial conundrums.

In comparison below a very simple manipulation has been used.
The comparison is about the back cover illustration by
Henry Holiday to Lewis Carroll's The Hunting of the Snark:

IT WAS A BOOJUM
 
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