What is the Grecian Urn?

I like to envision it as a spaceship careering through the galaxy.
Or, perhaps as an oracle that spins tales before gaping witnesses.

In what dimension does it reside?
Is it a spacecraft of some sort?
Is it a cosmic technology with advanced properties that allow it to unfold and 'play' the tales for viewers, or, in this poem, is the speaker looking at powerful but eternally still images and drifting off in silent reverie?

Here is a sequel to the urn, with the urn envisioned as a space craft locked in combat with Emperor Palpatine from Star Wars, with the gist being that the rich complexity of Keat's poetry is a far more advanced technology than the cosmology of Star Wars:

http://approaching40.typepad.com/ant...ecian-u-1.html

To restate:
What is the urn?
Any impressions or interpretations? :)

Paul
antiaging4geeks.com

There was a running joke on Rowan and Martin's Laugh In
way back when that show was on the air. Rowan would ask
"What's a Grecian urn?" And Martin would reply: "About a dollar and a quarter an hour!"

Of course, they made the same error that George Bush II made: Grecian is the adjective, "Greek" is the person.