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During the classical period art was generally created for historical reference, religious inspiration, or simply aesthetic enjoyment.
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Roman sculptors produced copies of Greek sculptures.
Presumably the contemporary buyers knew that they were not genuine.
Farid’s team took a huge, high-resolution photograph of a painting by Perugino—best known for his Sistine Chapel frescoes.
Starting with an 8-by-10-inch nagative, the photograph was digitized into 16,852 by 18,204 pixels, divided into sectors, and run through a series of filters and algorithms.
With the help of its software, Farid’s group then concluded what many art historians had long suspected: one artist—presumably Perugino—painted the Madonna and one canonized pair, while three other artists—presumably Perugino’s understudies—composed the remaining faces.