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Study of the patterns used by the artist
The artists of mural paintings used to realize patterns to draw their characters. In the Stoning of Saint Stephen it has been studied the faces of these figure and, as seen in the image on the right, it is obvious that there is a pattern that was repeated.
The three faces of the executioners, for example, are equal. Each one is represented with a different color. The painter only changed the inclination of the head, the eyebrows or the hair.
All heads were overlaid by computer to verify the similarities and differences between them.