This study is about a less recognised and controversial phenomenon in rock art production. In my opinion certain images and/or elements of an image have intentionally been “hidden” by the manufacturer, possibly for several (often differing) reasons. A small selection of examples from all over the world have been included and illustrated. However, I argue that the most “conspicuously” “hidden” elements are not even present; they are invisible (on purpose!).
By Maarten van Hoek





























