An Ode to a Grecian Urn

In case you were wondering, the title was inspired by Keats and this is read in the style of Ernie Kovac's character Percy Dovetonsils.

"O Grecian urn! you sit there
  on your august marble plinth
  your skin is red and dusty
  and you've got numerous crackth and denth [you talk about a rhyme scheme!]
 your persons are black and flattened
 as they fight two-dimensional beasts
 paper thin swanths theem to fly away
 followed by paper thin black thable geethe
 a lonesome thought enters my mind
 as I sit in pensive reflection
 could it possibly be your artist had no visual depth perception?"