Puzzled

Here’s a puzzle the internet did not solve instantly. Why are these haystacks covered? It’s not hay? Ok, but why are they covered? I’m sure I asked someone at the time. But, I’ve forgotten the answer. An internet search turns up Monet or haystack cookies. Geez! My attention span is short. It’s a mystery now. I took the picture because it was different. It has stood the test of time. Maybe they did it just for me to come along and take a picture. Hmmmm…nah!