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My inspiration for the story is the actual hay bales here in North Dakota. They are almost all round. While living in California, all of the hay bales I ever saw were rectangular. The 'grass wheels' here are intriguing because of their different shape. You can see them on the side of the road or in a field. They are wonderful in the fields during the golden light that casts their shadows at the end of the day. After living here for over 15 years, I still love to see them.