DY: It is nonexistent. The Greco-Roman Avodah Zarahs are pretty well-preserved. We know what we’re seeing. As far as I could find (and I researched this when I learned this Gemara) there is no idol of something holding a ball. At all. So either Chazal were making up a concept of an idol that didn’t exist (because why would we assume that any ball represents the world unless, you know, we know the case of a ball that actually does represent the world) or they were talking about an actual idol.
Joseph: That’s nice. Again, if you say like the Rishonim Chazal don’t make any sense. Ruach HaKodesh does not mean infallible.