When you get up above the earth, you look down and begin to see shapes. Many are made naturally and others are ancient sites, usually circular. The ones in South Africa (below) were dated around 300,000 years!
Pisco Valley, Peru
Circlestone, Superstition Mountains, AZ
What did this shape mean to the ancients? It is repeated in clusters like grapes, with a lines bisecting it, in consecutive circle within circle and spiral forms.
England (cup and ring shape)
Tucson, AZ (spiral)