Wait, this confused me for a moment, as I was about to decline and express best wishes going forward. I share Alberto's perspective, especially with applying something like Microscope or Dungeon World/The Perilous Wilds. I'm not a fan of the Fate mechanics behind Spirit of the Century, but it similarly puts the players (not player characters) on equal footing in regards to creating the setting during session zero or session minus-one or whatever. So, I guess I'm still intrigued by Alberto's initial pitch but not in the framework Pollux proposes, not that there's anything at all wrong with it. It's just not what interests me at the moment. I had a blast playing in a format similar to what Pollux describes at PrinceCon for several years, and it definitely can work wonders with the investment of a lot of blood, sweat, tears, and more blood. To Alberto's point about surprising the players, I've had groups recognize this flaw and make it a feature. "I think there's an ancient wizard tower here that just kind of stops at like the fourth floor. It's not crumbled with age, just... missing. Like it disintegrated or got shunted into another plane or something. And no one seems to know if the wizard's alive, dead, trapped, missing, or what. I guess we should leave all that for the DM to decide..." By getting a say in content, the players also get a say in what questions remain deliberately unanswered.