Five upside down stars over a windmill

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Five upside down stars over a windmill

I live in a really small town in CA and there is an old house that has fascinated me since I was very young. It's made out of thousands of smooth river rocks and has tiny doors all around the outside leading to a basement level. The whole house is just really irregular and strange looking from the outside. But the thing that's always caught my attention the most is this wall in the side yard you can see from the street. Made out of the same stone the house is, there is a large scene depicting a windmill with five inverted stars above it. One directly above the windmill and two on either side. Does anyone know what this is? I can't find any reference to it on the Internet and I've been wondering for like 20 years now.