Chris Claremont is best known for his 17 year unbroken run on the X-Men comic series — a feat in world building that has supported many uses, from comics to movies to video games and more. Now Chris is returning to that world, with a new comics series titled X-Men Forever. This time, the rules are different. Mr. Claremont addressed thoughts and considerations that go into building a world that can support years of use, and variations. How has the concept of world-building changed over time? What is the purpose of continuity? Multiplicity? How to take into account growth and risk, and play outside the rules.