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haha or ha-ha barriers are oftern found in large landscape projects of a few centries ago to the present day. They were designed often to stop cattle. They are special as they give an uninterupted view above them as sunk into the ground out of site. They commonly consist of a wall faced by a deep ditch. and on the land above the ditch at a distance the wall is invisable. --Govanus (talk) 20:54, 3 June 2015 (UTC)