After passing through a door, you use a feather to put the finishing touches on a folding fan. The door leads to your folding fan workshop where you make all your folding fans. This folding fan is now complete that you’ve added a feather to it. How lovely it is.
Your biggest folding fan customer is a centaur (せん). This centaur just loves your folding fans and this one you just made with the feather was for the centaur’s latest order. You go back out your door and deliver this folding fan to the centaur.