A one-dimensional universe would preclude the circle, because if a circle were included it would have diameter AND would be effectively infinite (although a straight line could be of infinite length). No circle, no pi.

As for the grail, it was entrusted to me three years ago by an old man, a descendant of Percival (or Parsifal, if you prefer). He had no descendants and was the last of his line, so he entrusted it to the only person he knew who was "sans peur et sans reproche." He -- his surname was Dulac and I never knew his first name -- died very shortly thereafter and was "buried at sea" in what remains of Gray's Lake. I wasn't at his funeral and so cannot verify the stories about it so I shan't repeat them here.