[SunkenCiv]

This sounds plausible. At least one of his works was found by xray (or some such technique) lying under the work of one of his students. "Just use this old canvas". Imagine... This one, in the National Gallery, has an image on both sides, but they are parts of the same work. S'cool. I think it's the only da Vinci painting on this side of the Atlantic (other than privately own stuff, or minor works like studies or sketches).

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[wagglebee]

There is some good privately owned Da Vinci stuff in the US. Bill Gates bought one of Da Vinci's diaries several years ago.