Conceptual artist Marcel Duchamp was known for his readymades, which declared everyday objects to be works of art — most notably Fountain, a public urinal on a pedestal. Duchamp was also something of a chess obsessive and created both an ornate tabletop set and a travel version, the latter of which he wanted to mass-produce. The first of the pair, however, was thought to have been lost to a private collector, so no-one would ever again be able to play with it at least, until now.