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When it rains in the Namib, a thick carpet of grass covers the sand and stony desert. But this green layer is punctuated by bare circular patches, as regular as if drawn by a compass. And there are not just one or two of them, but hundreds of thousands. Observed from the air, they could be innumerable golf bunkers - or an abstract painting: «Red dots on green background». They appear between 60 to 120 kilometres from the coast and stretch from South Africa to Angola. They are bordered by a ring of tall, thi
