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This is an example of a simile in the following:
Molly plodded gingerly forward and headed toward the trees at the far end of the pasture. Her back was like a soft, warm rocking chair, and I loosened my grip on Donna's waist. Birds sang and flowers nodded in the meadow below. Filled with the beauty of the country, I was suddenly compelled to whoop with sheer joy.
What is Her back was like a soft, warm rocking chair