What are some of the literary devices in "Ode on a Grecian Urn"?

Well, a good place to start is looking at the first stanza
of this excellent poem and seeing the number of metaphors that are contained even in the
first three lines. Let us remember that a metaphor is an example of figurative language
that compares one thing with something else without the word "like" or "as." See if you
can spot the three metaphors in the first three lines of this excellent
poem:

Thou
still unravished bride of quietness,

Thou foster child of
silence and slow time,

Sylvan historian, who canst thus
express

A flowery tale more sweetly than our
rhyme...

The speaker of this
poem then begins his Ode by comparing the Grecian urn he is contemplating to an
"unravished bride," a "foster child of silence and slow time," and a "Sylvan historian."
Note the point of these metaphors: Keats is highlighting how the urn is undamaged by
time by comparing it to a virgin bride; he is saying how it has long been protected by
comparing it to a "foster child" of time and silence"; and lastly, he shows how it
preserves history by calling it a "Sylvan historian." Now, see if you can find any other
examples of literary devices in this poem. Good luck!