Read the analysis of a theme from "Ode on a Grecian Urn."One theme in "Ode on a Grecian Urn" is that art is an eternal and unchanging truth.Now, read the passage from Keats's poem "On Seeing the Elgin Marbles."So do these wonders a most dizzy pain,That mingles Grecian grandeur with the rudeWasting of old Time—with a billowy main—A sun—a shadow of a magnitude.