Nail Mosaic.

A few years ago Tirana (Albania)-based artist Saimir Strati made a very large mosaic out of nails, a portrait of Leonardo Da Vinci. According to the Guinness Book of World Records its world's largest nail mosaic with about 500,000 industrial nails. Using industrial nails, the artist re-created the self-portrait of Leonardo Da Vinci using nearly 400 kilos which covered a 2 x 4m surface. It was created in the month of September 2006 and it's said that it took about '24 days' to create this portrait.

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