The Purusha Sukta (Rigveda 10.90) is one of the most cosmologically ambitious hymns in the Vedas. It opens with this image: the Purusha — the cosmic Person — has a thousand heads, a thousand eyes, a thousand feet. He envelops the entire earth on all sides, and still extends beyond it by ten fingers.
'A thousand' in Vedic language means infinite — beyond counting. The Purusha is not a person with a body that ends somewhere. He pervades everything, and then some. The universe as we know it is only a fraction of his being.
This hymn goes on to describe how the universe was created from the sacrifice of this cosmic Purusha — the sun from his eye, the moon from his mind, the sky from his head, the earth from his feet. It is one of the most influential texts in all of Vedic cosmology.