You are the sky.

You will cease to feel isolated when you recognize, for example, that you do not have a sensation of the sky, you are that sensation. For all purposes of feeling, your sensation of the sky is the sky and there is no You apart from what you sense, feel, and know. [1]

This is why the mystics, and many of the poets, give frequent utterance to the feeling that they are One with the all or united with god. The same thing by many names, a connection to the Universe.

"Foregoing self, the Universe grows 'I'." ~ Sir Edwin Arnold

References

The Wisdom of Insecurity, by Alan Watts