Desert kite
Desert kites are stone structures with a convergent shape. They are made of linear piles of stones. The structures have lengths between  less than a hundred metres to several kilometres and heights of less than one metre, even accounting for erosion. Often, there are gaps in the lines. These gaps may have been left by the builders on purpose. They may also have been the result of lines formed by alignments of cairns rather than a continuous row. There are  different shapes that are referred to as "desert kites". The lines usually form two walls ("antennae") that converge into an enclosure ("head") with attached cells. The common kite type varies by region.  Sometimes the existence of these cells is considered essential for a desert kite.