Although not directly related to the OPs topic of 'What is outside our universe' - but since the thread has digressed somewhat anyways:
I always liked Carl Sagan's mathematical ending in his novel 'Contact' - whereby the creator of the universe (not necessarily a 'god' - as Sagan was an agnostic) - left their signature (so to speak) within the digits of Pi - way downstream in base 11 math where the seemingly randomized Pi digits become 0's and 1's and eventually form another perfect circle when rastorized in a square algorithm.
I read the book years before the movie came out - and actually drew a diagram on the last blank page of the book to help myself visualize the concept of the ending.
I was always disappointed the novel's ending wasn't used in the movie.
/end digression
