What type of painting was Vasari referring to when he said it "is the most masterly and beautiful because it consists in doing in a single day that which,in other methods,may be retouched day after day,over the work already done"?

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The Answer of What type of painting was Vasari referring to when he said it "is the most masterly and beautiful because it consists in doing in a single day that which,in other methods,may be retouched day after day,over the work already done"?

What Type of Painting Was Vasari Referring to When He