The theme of “Ode on a Grecian Urn” is that art is eternal and unchanging. Keats repeats the words “for ever” to show that the image on the vase never changes. By contrast, “On Seeing the Elgin Marbles” suggests that nothing lasts forever; according to the poem, even art is subject to the “rude / Wasting of old Time.”
<span>Both are describing some aspect of OUTSIDE/SEASONALITY: "Ode on a Grecian Urn" states, 'shed your leaves, nor ever bid the spring adieu' (leaves and spring season) and “On Seeing the Eligin Marbles” states, ' a sun , a shadow' (sun and shadow- could be summer and fall?). They also make a comparison about TIME, : "Ode on a Grecian Urn" states, 'shed your leaves' and On Seeing the Eligin Marbles,” 'wasting of old time.'</span>
