Paul, why are you posting optical illusions? This isn't an optical illusion. You can see the shape how it really is. You can reorient it if you like, and maybe it'll look more like a dimple than a blob, but the same would be true of the other ones.

Mt point is, those sun blobs from NASA are consistent with compression artifacts. The problem is most people don't understand the technology they're using enough to recognize a compression artifact.