The use of a rainforest, jungle or wilderness as a literary device was common in literature at the time. Some contemporary novels which use this device include The Wizard of Oz.
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Replied to: The use of a rainforest, jungle or wilderness as a literary...
The title of this book is meant specifically as criticism of capitalism. Sinclair's Packingtown, where the action takes place, is reminiscent of a jungle for its competitive, amoral survival-of-the-fittest atmosphere.