On Books and Signs

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The Magic_mouth asset is usually invisible in-game
and can be used to generate flavor text when activated
with a button or other trigger. This can also be triggered
by when a player steps on it.
You might consider using this to generate messages or
environmental descriptors to futher flesh out your ideas.

It is possible to set this to only activate once by modifying
the activate_on_release tag to 0.

The sign asset is a stationary readable asset that is usually
not able to be picked up by the player. Similar to the
magic_mouth, signs can be connected to a button or other
trigger though this does not occur often.
Setting your sign as Subtype 1 can trigger a separate message
box displaying the signs message on some clients, 
Jxclient is one such example.

The book asset has a handful of different faces that can
appear different but function essentially the same.
Books can be made not able to be picked up if your zone
calls for this.
Books are a great way to diseminate hints or lore, just make
sure what you add is relevant.