Stone spheres are evidence of electric storms. They were not formed in the ground subject to gravity, nor were they carved by giants. The spheres were formed by dust drawn into lightning channels and fused in the atmosphere like hailstones, which accounts for the spherical shape. Why they appear at or near beaches will be discussed in future articles.
I have a collection of many hundreds of images of these 'spherical boulders' from all over the world. This would be the best explanation of how they were formed...