Example: * Quiet Shelf - A scenery supporter which does not list its contents in the room description.

    "Quiet Shelf"

    Include Ordinary Room Description by Emily Short.

    Sample Chamber is a room. The shelf is scenery in Sample Chamber. On the shelf is a gold coin.

    A description-concealing rule:
        now every thing on the shelf is not marked for listing.

    Test me with "look / get coin / look / drop coin / look".