Sir Peter Blake, Cornelia Parker, Richard Reed and more give their reactions to the launch of Art Everywhere as John Singer Sargent's epic painting "Gassed" is unveiled at a poster site in London.

Art Everywhere will be live on 22,000 poster sites across the UK from 12-25 August. Find out more on the Art Fund website: artfund.org/news/2013/08/08/art-everywhere-creates-the-worlds-largest-art-show

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