This Lime-Tree Bower My Prison
How we cite our quotes:
Had cross'd the mighty Orb's dilated glory
While thou stood'st gazing; or, when all was still,
Flew creaking o'er thy head, and had a charm
For thee, my gentle-hearted Charles, to whom
No sound is dissonant which tells of Life. (74-78)
The bird is a traditional symbol for the spiritual soul that flies "above" the material world. But this bird makes an awkward "creaking" sound that can only be understood in the context of nature as a whole.