What is the meaning of phrase simple sheep in Poem a thing beauty?

In the poem "Ode on a Grecian Urn," the phrase "simple sheep" refers to the sheep depicted on the urn. Keats uses this phrase to contrast the simplicity of the sheep with the complexity and beauty of the urn itself. The sheep are depicted as being content and at peace, while the urn is filled with intricate carvings and symbols that represent the complexities of human life. The contrast between the two highlights the idea that beauty can be found in both the simple and the complex.

The phrase "simple sheep" also suggests a sense of innocence and purity. The sheep are depicted as being unaware of the complexities of the world around them, and they seem to be content with their simple existence. This innocence and purity is in contrast to the more worldly and experienced figures depicted on the urn, who are often shown to be struggling with the challenges of life.

Overall, the phrase "simple sheep" serves to highlight the contrast between the simple and the complex, and to suggest that beauty can be found in both. It also suggests a sense of innocence and purity, which is in contrast to the more worldly and experienced figures depicted on the urn.