One theme in "ode on a grecian urn" is that art is an eternal and unchanging truth. now, read the passage from "ozymandias," another poem from the romantic period. 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. while the theme of "ode on a grecian urn" focuses on how art is eternal, the theme of "ozymandias" focuses on how royalty is superior. nature endures. things change. deserts are lonely.