I met a traveller from an antique land
Who said: Two vast and trunkless legs of stone
Stand in the desart. Near them, on the sand,
Half sunk, a shattered visage lies, whose frown,
And wrinkled lip, and sneer of cold command,
Tell that its sculptor well those passions read
Which yet survive, stamped on these lifeless things,
The hand that mocked them and the heart that fed:
And on the pedestal these words appear:
"My name is Ozymandias, king of kings:
Look on my works, ye Mighty, and despair!"
Nothing beside remains. Round the decay
Of that colossal wreck, boundless and bare
The lone and level sands stretch far away.
- Percy Shelley, “Ozymandias”
mocked=imitated. So the skill of the sculptors hand that was able to capture the emotions (passions) that came from Ozymandias’ heart where those emotions truely lived. They were part of his core being, not an act or a face he had to put on to be able to rule.
It’s saying the sculptor was exceptionally skilled and was able to capture the very essence of Ozymandias’ being.