today's literary term

chiasmus!

chiasmus (ky-AZ-mus) n .
a reversal in the order of words
in two otherwise parallel phrases.
chiastic adj

Church failed mankind,
or has mankind failed the Church?"
-- T. S. Eliot

"And what should they know of England
who only England know?"
-- Rudyard Kipling

"Is getting well ever an art
Or art a way to get well?"
-- Robert Lowell

"When water turns to ice does it
remember one time it was
water?
When ice turns back into
water does it remember it was
ice?"
-- Carl Sandburg