"It's X's world. We're (all) just living in it."

[Laurence Horn]

 From today's Times (E1):

"Three centuries later, it's still Louis XIV's world.  We're just
living in it."

It occurs to me that although I've heard this countless times, with
various values for the variable in the subject line, and of course
without the necessary presence of the "still" in the version cited
here, I have no idea where and when it originated, and Google, which
offers 1620 hits on "world we're just living in it", doesn't
immediately help.  Does anyone know?  (And what's the
lexical/constructional counterpart of an earworm, anyway?)

Larry