New Delhi, March 11 -- The Rev. Paolo Venturelli never gets too close when he visits Leonardo da Vinci's "The Last Supper." The Dominican friar prefers to stand away from the wall where it was painted, on the opposite side of the room once used by members of his order for meals.

"From there, the painting looks as though it were painted in the middle of the refectory," said Venturelli of the masterpiece depicting the Gospel story of Jesus' final meal with his apostles. "It unleashes all kinds of human and spiritual reactions."

He lives in Santa Maria delle Grazie, a convent and basilica in Milan where Leonardo worked in the 1490s at the request of Ludovico Sforza, then ruler of the city.

"The Last Supper," which illustrates the biblical...