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A rich American went to Paris and bought a expensive picture by a modern artist. He thought that the picture was very good. He came at the hotel, hanged the picture in the dining-room. He didnt know what was the top and what was bottom. He invited the artist to dinner. They began to eat and the artist looked at the picture. Then, he put on his glasses to look at it again. So, the artist approached the picture to look at it more closely. The artist told the men that the picture was upside down. The American wondered why the artist had not told it to him at once. He answered that he hadnt been sure about it. The rich man left this picture as it was. He said, that nobody would guess, that it was upside down.