I know it’s treading familiar ground, but back to the Tallet question: I had another experience on Shabbat of the Superman style being presented as normative. This time from a really nice person who is also learned. Therefore I felt that he would enjoy seeing a primary source that responds directly to the Shulhan Arukh OH 8:4 which says that one “puts two tsitsiyot in front of him and two behind so that he is surrounded by mitsvot.”Anyone have it handy for all of us to enjoy?[Edit: Maran's language is a retread from the Tur, same siman. The Bet Yosef there explains that it is based on the Ittur Soferim, itself based on a Midrashic statement. A responsum of the Radbaz (3:571) gives other approaches to this issue, including a different read of that Midrash, but I'm looking for something with a nice pithy quotable quote.]