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Travelling in China, you may see a particularly tall tree on a mountain or in a park; its colour is similar to other trees around it. But when you move and look closer and touch this tree, the texture does not feels like tree bark but a plastic surface. It is actually a signal tree, the telecom operators’ idea to preserve the natural landscape. So, signal towers are built in the shape of a tree. This is a construction unique to urban development in China.Image source:  gaomin.t.sohu.com