Shelley was a romantic poet.

Romantic poets tried to capture intense experiences and to focus on the POWER of nature.

Shelley disliked monarchies, absolute POWER and the oppression of normal people.

POWER

ARROGANCE

PRIDE

JUXTAPOSITION

"survive" and "lifeless" oppose each other

This suggests that although Ozymandias had lots of human POWER, this POWER has been lost

Nature and time have the real POWER here, as they have destroyed the statue