I found their review utterly convincing — although probably not in the way the authors might hope.
Observing a crumb trail and an opened cookie jar, we infer that a child has been at work. Science requires more precision in weighing explanations.
Returning to your winter retreat, mentioned in the last post, the symbols you discovered remain on your mind.
The carvings look sustained (there are many of them) and deliberate, unlike creases created by splitting and pitting of surfaces over ages.
Hans Vodder is a friend with whom I’ve been enjoying an unfolding discussion for well over a year.