A complete world does not need to show its whole hand. In fact, a world that explains every history, answer and intention gives a guest very little to do beyond receive it. Imagination Gaps create co-authorship. They leave room for curiosity, debate, headcanon and the kind of comparison that makes people return or keep talking after they leave.
The important distinction is between a gap and a hole. A gap suggests Unseen Completeness: a detail, clue, consequence or trace that proves something larger exists. A hole leaves the guest wondering whether anyone decided what matters. Design the full answer backstage, then choose what to reveal, hint at, hide and never explain. Secrets should be discoverable, but never mandatory for access, safety or basic enjoyment.
Calibration matters. Gap Width asks how much is withheld relative to a guest's confidence and knowledge. A cold guest, casual guest and confident expert do not need the same amount of certainty. Mystery Box Debt asks how many unanswered questions they are carrying. Every open question borrows attention. Service it with progress or a clue, repay it with a payoff, or make its continued openness feel intentional.
