This essay explores the relationship between pictures and the lighting conditions in which they were originally viewed. The theoretical interrelationship between brightness, illumination and depiction is explored in a case study of Leonardo da Vinci’s Last Supper mural at the refectory of Santa Maria delle Grazie in Milan. Advanced rendering software allows for the reconstruction of the refectory as it stood when Leonardo painted The Last Supper and demonstrates the complex interaction between light and space in the mural. This analysis illustrates how digital humanities might bridge traditional art-historical methods and forensic visualization.

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