Excellently said portia!
So just remember these golden phrases:
"blurring boundaries between high art and low art"
"all texts are equal and no text is original (intertextuality)"
-postmodernism focuses on surface values and accepts the lack of certainty and depthlessness
On intertextuality, basically saying that no work is unique:
'A text is... a multidimensional space in which a variety of writings, none of them original, blend and clash. The text is a tissue of quotations... The writer can only imitate a gesture that is always anterior, never original. His only power is to mix writings, to counter the ones with the others, in such a way as never to rest on any one of them' (Barthes 1977, 146)