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In page The Last Supper (Leonardo):

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The painting contains several possible numerical references, including to the number three. The Apostles are seated in groups of three, there are three windows behind Jesus, and the shape of Jesus' figure resembles a triangle. His hands are located at the golden ratio of half the height of the composition.[3] The painting can also be interpreted using the Fibonacci series: one table, one central figure, two side walls, three windows and figures grouped in threes, five groups of figures, eight panels on the walls and eight table legs, and thirteen individual figures.[3] Debates among art historians still surround the use of the Fibonacci series as some argue that its purposeful use did not fully begin be applied to architecture until the early 19th century.[1]