The word for "world" is "forest" (minor-ish) spoilers
Apparently it was written as a protest against US militarization and the Vietnam war.
It tells the story of Terran colonists on a planet that has native humanoid life-forms, that are numerous, but strangely pacifistic.
Natives considered dream and waking world to be both real. At one time one of them dreamed new thing that could break their enslavement.
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