According to a private communication (ConNuestroPeru), the archaeologists
are recovering some waru-warus having circular and radial shapes.
In fact, several waru-warus create geoglyphs featuring animals.
The "raised fields" are earthworks separated by canals. This is an ancient agricultural technique used by Andean people starting from the first millennium BC. Each raised field is approximately 10 meters large and more than one hundred long.
More on waru-waru
arXiv:1009.4602 [pdf] Geoglyphs of Titicaca as an ancient example of graphic design, Amelia Carolina Sparavigna