This example involves redesigning the LISTEN command, removing its built-in function and replacing that with something more ambitious. We will learn more about how to do this later on.

"The Art of Noise"

A thing has some text called sound. The sound of a thing is usually "silence".

The report listening rule is not listed in the report listening to rules.

Carry out listening to something:
    say "From [the noun] you hear [the sound of the noun]."

Instead of listening to a room:
    if an audible thing can be touched by the player, say "You hear [the list of audible things which can be touched by the player].";
    otherwise say "Nothing of note."

Definition: a thing is audible if the sound of it is not "silence".

Before printing the name of something audible while listening to a room:
    say "[sound] from the "

The Sharper Image is a room. The pet rock is a thing in the Sharper Image. The toy car is a thing in the Sharper Image. The sound of the car is "whirring and zooming". The plastic widget is a thing in the Sharper Image. The sound of the plastic widget is "bleeps and bloops". The pointless gadget is a thing in Sharper Image. The sound of the pointless gadget is "buzzbuzzbuzz".

The soundproof case is a transparent openable container in the Sharper Image. It is closed and fixed in place.

Test me with "listen / listen to rock / listen to car / get all / open case / put all in case / listen / close case / listen / listen to car".