Why is The Flagellation of Christ unusual among paintings of the subject?

The Flagellation of Christ by Piero della Francesca is considered unconventional and enigmatic due to its departure from traditional depictions of the subject.12

While the scourging of Jesus was a common theme in 15th-century art—typically featuring the central figure as the primary focus—Piero’s treatment is strikingly different. In his composition, the event is relegated to the left background, occurring within a tiled gallery rendered with precise perspective and foreshortening.132

The right foreground is instead dominated by three unidentified figures whose relationship to the scene remains a source of enduring academic debate. This deliberate displacement of the main subject, combined with the painting's mathematically rigorous composition and resistance to clear interpretation, distinguishes it from more traditional, decorative, or symmetrical religious works of the era.123