Section: Concealment

(1) Concealment. Room description control allows the author to mark any visible item as "not marked for listing" before it reaches the later stages of room description, using description-concealing rules. Thus we might turn off mention of items on a high shelf like this:

    A description-concealing rule when the player is not on the chair:
        now every thing enclosed by the high shelf is not marked for listing.

or make some objects invisible in certain circumstances:

    A description-concealing rule:
        if the diamond is in the glass, now the diamond is not marked for listing.

    A description-concealing rule when the player wears the peril-sensitive sunglasses:
        now every dangerous thing is not marked for listing.

After concealment, all remaining items -- that is, every visible thing except the player, the player's possessions, scenery objects, and items explicitly concealed -- are added to a Table of Seen Things.