Credit: Jean-Claude Marquet, CC-BY 4.0 (https://creativecommons.org/licenses/by/4.0/)
Examples of engravings discovered in the Roche-Cotard cave (Indre et Loire - France). On the left, the "circular panel" (ogive-shaped tracings) and on the right the "wavy panel" (two contiguous tracings forming sinuous lines).