As we were taught in entoptic studies, these are not elements of a proto language, they are externalizations of the occipital/retinal that both reference the brain and reference space - together.
They are the basis for a spatial language of topological parts that have yet to be realized but does integrate with the plastic arts. ie are these the source of pictograms as language? Probably not. Is there are continuity with Kurgan or Chinese ideograms? We can't find them. Is there a continuity between counting tokens and alphabets? Yes, there's a stronger case for that.