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Professor Watanabe of Keio University has carried out a series of
experiments on the vision and emotion of animals, using painting
for his tests. "Pigeons." he claims. "seem capable of distinguishing
a figurative painting by Monet from an abstract canvas by Picasso.
" His team trained pigeons to make this distinction by rewarding them
for each right answer. By continually repeating the experiment, the
researchers were able to get the pigeons to recognize a Monet or a
Picasso even upon seeing it for the first time. What's more, the ones
trained to react to Monet's work proved sensitive to Cézanne, while
those accustomed to Picasso recognized Braque.

Nippon Kenzai Shimbun, March 1997