The verbs 'sunk' and 'shattered' show nature has eroded and destroyed this symbol of human power. This suggests the natural environment will always outlast any human settlement, reminding us of our own mortality; even the most powerful kings will turn to dust
Show his inflated opinion of himself. He was clearly a tyrannical ruler who seemed to use his power to punish others. When he addresses the "Mighty" he could have been talking to the gods, suggesting his deluded opinion of himself
Symbolise the legacy of Ozymandias, nothing but crumbling stone that is turning to dust. The oxymoron "colossal wreck" suggests the fragile nature of human power – even the mightiest will fall
The verb "stretch" suggests that nature will outlast man and humanity – our place on this earth is only temporary and is no match for our natural environment and time