Barely discernible among the surrounding rock-strewn ground, a meandering dirt track winds its way up a barren, windswept hill. In the arid heat, dotted amid the dry ocher soil, the rocks look baked from the sun. A few stubby trees and scrubby bushes bestrew a landscape with no obvious signs of habitation in this parched land of northern Kenya. But on top of the hill, sitting behind a low wall made of the abundant stones that litter the ground, we find six men. They have been living on the hill for eight years.