Laughing stone #4 on this blog
Mike Raver find, Zanesville, Muskingum County, Ohio. Found in the context of tools and other portable rock art pieces, some of which have been published on this blog. Mike's blog is here.
Laughing stone, Zanesville, Ohio, has a mouth angle similar to the maximum angle which can be achieved by the human hand in "laughing hand puppet" position as seen in the photo below.
The head of this anthropomorphic "stick figure" form in Brazil cave rock art resembles the outline of the shadow of the human hand puppet form. Perhaps this kind of hand puppet was used as a prop or medium in story telling which was recognized and collected when natural rocks with a similar form were discovered.
-kbj
