By Thomas Peter
"It feels good to walk in nature after so many months of boredom in the Immigration Holding Centre,” said Sallisou as we walked along a poplar-lined alley in the sleepy hinterland of Potsdam-Mittelmark, a rural county just outside the German capital of Berlin. Two weeks earlier, the smiling man from Niger had joined a 600 km (372 miles) foot march of refugees. With every county border they crossed, they were breaking a state order that restricts their movement to a territory around their camp. At present, Sallisou was eagerly filming the procession of refugees with a small video camera.