It is all one. A single organism. From this single body we call the universe many conscious beings derive. Though many conscious beings derive there remains a singularity in the oneness of the body and existence. This is called Universal Mind.
Nothing has any real existence separate from the whole.
We mistakenly perceive the universe as existing separate from ourselves. Intuitively however, we know this is not true. We know because our very existence depends on the universe itself. This is a physical fact we cannot escape. Like the blade of grass it takes the entire universe for one human being to grow.