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				 That was the unique opportunity restorers in Florence have 
				relished as they clean the "Adoration of the Magi", a massive 
				painting that Leonardo started in 1481 at the age of 29 but 
				abandoned a year later, leaving it in various stages of 
				conception and development. 
				 
				The painting on wood, measuring about 2.5 by 2.5 meters (8.2 by 
				8.2 feet) depicts the three wise men who paid tribute to the 
				infant Jesus in Bethlehem, but it also includes a riot of human 
				figures, battling horses, architectural designs, landscapes and 
				skies. 
				 
				Done on 10 slabs of wood glued together, it has blank areas, 
				areas with under-drawings, and sections in advanced stages. 
				 
				"This is perhaps the most quintessential work-in-progress in the 
				history of art," said Cecilia Frosinini, one of the directors of 
				the ongoing restoration of the work, which is slated to return 
				to Florence's Uffizi Gallery next year. 
				 
				"Leonardo never wanted this to be seen by anyone at this stage, 
				probably not even by those who commissioned it, probably not 
				even his assistants. This is the phase in which he was still 
				elaborating in his mind what the final work would look like," 
				she said, standing in front of the piece. 
				
				  
				Leonardo received the commission to paint an altar piece 
				depicting the Adoration from the monks of the monastery of San 
				Donato a Scopeto, near Florence. He stopped abruptly when he 
				left to take up an offer of steady income from the Dukes of 
				Milan. 
				 
				In the late 1500s it was acquired by Florence's Medici family, 
				whose restorers added layers of both clear and sepia-colored 
				varnish to give it a homogenous, monochrome look when they put 
				it in their collection. 
				 
				The current restoration project, which began three years ago, 
				has removed much of the dull, oxidized varnish as well as traces 
				of past restoration attempts, revealing many previously hidden 
				details, facial expressions and subtleties of light and shadow. 
				 
				There are sections where the same horse's head is drawn in 
				various positions, where horses in battle still have three hind 
				legs because Leonardo still had not decided which would go and 
				which would stay. 
				 
				A PEEK AT A SECRET 
				 
				"The great fascination of this project was seeing something that 
				we were not supposed to see, standing behind the artist and 
				imagining what the final version could have looked like," said 
				Patrizia Riitano, one of the two restorers who cleaned it. 
			
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			"I hope that I have been able to enter Leonardo's mind, at least a 
			little bit," said Riitano, who has also worked on paintings by 
			Raphael and other Renaissance masters. 
			The restoration showed that despite the large size of his work, 
			Leonardo did all the under drawings freehand, eschewing the 
			"cartoons", or dotted-lined outlines, used at the time to divide 
			large complex works into sections. 
			 
			"We have gotten close to this inexhaustible genius who is never 
			satisfied with his work, who wants to be totally free, even from 
			himself, free from the restrictions that the cartoons would have 
			imposed," said Frosinini. 
			 
			"It is as if we are privy to a private conversation - Leonardo 
			talking to himself, perhaps even arguing with himself," she said. 
			 
			Experts at the Opificio delle Pietre Dure, Italy's premier, 
			state-run art restoration lab, have ruled out a hypothesis put 
			forward 15 years ago that Leonardo had done only the preliminary 
			work and the paint was added by an unknown artist long after the 
			master's death in 1519. 
			"Of course there were restorations and small additions here and 
			there over the centuries but we are convinced that this is all 
			substantially Leonardo," said Roberto Bellucci, a renowned expert on 
			cleaning oil paintings who restored it with Riitano. 
			 
			In 2001, the Uffizi, after much public and in-house hand wringing, 
			decided not to restore the masterpiece because it was deemed too 
			delicate by some. 
			 
			Improved techniques and more scientific studies convinced the Uffizi 
			to go ahead with the restoration this time. 
			 
			Marco Ciatti, the head of the restoration lab, said that if the 
			cleaning had not gone ahead, viewing it would have been "like trying 
			to read a book of poems in a dark room". 
			
			  
			 
			 
			After the wood backing of the painting is restored, it is due to 
			return to a special room in the Uffizi, where it will be on display 
			with two other Leonardo works. 
			 
			(Reporting By Philip Pullella; Editing by Michael Roddy and Sonya 
			Hepinstall) 
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