This question is based on General Literature Principles and Literary Appreciation. 'I die, yet depart not, I am bound, yet soar free; Thou art and thou art ...

This question is based on General Literature Principles and Literary Appreciation.

'I die, yet depart not,

I am bound, yet soar free;

Thou art and thou art not,

And ever shall be!'

'The City of Dreams' by Robert Buchanan. The literary device consciously used in the above extract is