Dot/cuppule. Series of dots. Line: straight, wavy, zig-zagged, or curved: simple curve/arc, open or closed; spiral. Series of lines: parallel, non-parallel, crossing; joined free-form or as a regular/irregular polygon....
Only a finite number of figures that can be formed, no matter where in the world the rock art is created.
Combine that with with evolutionary psychologist Ellen Dissanayake and you get
Malotki, a professor emeritus of languages at Northern Arizona University, said no one would ever know the true meaning of images pecked or painted on stone pallets because the artists are dead and did not leave a record or "Rosetta Stone" to decipher the images' meanings.
Translated as, I am Dr. Ekkehart Malotki, a preeminent researcher into the history of rock art, and if I don't know the meaning, no one ever will.
The cups in the granite boulders near my house often have empty acorn shells in them.
Obviously, these were the work of squirrels.
And she says, the doodles are nothing but Jungian Archetypes hardwired into the psyche, nothing to see here...
They have both reached a dead end. They will never make the connection between what it is (for example)these symbols are trying to tell us:
Pictish Stone.
Or that a spiral symbol records a celestial phenomenon, seen worldwide: