Artists: Pop's Dado

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Recently a photographer asked Duchamp to sign his autograph book. He explained to the artist that, since those he photographs are his hosts, it was a sort of a guest book in reverse. Duchamp whipped out a pen and, writing backwards, jotted down his signature in a perfect mirror image. For what it is worth, this was also Leonardo da Vinci's favorite device, in his notebooks, for keeping his secrets to himself.