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From the author’s webpage:
Pig and Hen love painting portraits of each other: “Hen painted Pig in his rose garden. `Wonderful!’ said Pig. Pig painted Hen in her vegetable garden. `Beautiful,’ said Hen.” But when Hen has to take time out to hatch her eggs, Pig is lonesome. He goes to visit his friend and helps her pass the time. When Hen goes out for a lunch break, Pig amuses himself by juggling the precious eggs, then decides to paint them a spectrum of colors, with unexpected results.