Artist's depiction of Vogt southern petroglyph rock from Monroe County, Illinois, American Bottom. Note the circular, eye-like designs, and a cross-and-circle in an eye motif.

Fortier, A. 1995. The Vogt Petroglyph Complex in Monroe Co., Illinois. Illinois Archaeology 7(1-2): 82-101. Fig. 6

Image courtesy of Illinois Archaeological Survey.