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| Above is a ceiling fresco in the Palazzo Ducale, Mantua, Italy from 1473. It is one of several pictures in a book entitled "Optical Illusions" by Paul M. Baars ... and passed along this morning in email. |
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| Above is a ceiling fresco in the Palazzo Ducale, Mantua, Italy from 1473. It is one of several pictures in a book entitled "Optical Illusions" by Paul M. Baars ... and passed along this morning in email. |
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