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santiago sierra's artwork, currently showing at Lisson Gallery in London, can safely be called revolutionary. Exhibits consisting of rectangular solid blocks neatly organized on the gallery floor

Globally, 2.6 billion people lack access to safe and clean toilets. For example, 92 per cent of the population in Afghanistan don't have proper sanitation; 67 per cent in India as well. A

Three rooms of London's Lisson Gallery are currently home to 21 blocks of recycled human waste.&nbsp I walk in between them, passing my fingers over the surface of one, round the corner of

new York City is geared up for its first 20 public toilets. The self-washing and wheelchair-accessible toilets are expected to come up in December 2007 at Madison Square Park, Manhattan. It will

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