What metaphor was used in the book narrative of life Frederick Douglass?

While there isn't one single, overarching metaphor used throughout the entirety of Frederick Douglass' "Narrative of the Life of Frederick Douglass, an American Slave," the book is replete with metaphors that highlight the oppressive nature of slavery and Douglass's struggle for freedom. Here are a few prominent examples:

* Slavery as a cage: Douglass frequently compares slavery to being imprisoned, physically and mentally. He describes his life as a "cage," and emphasizes the feeling of being "shut out from the world."

* Slavery as a death: This metaphor reinforces the idea that slavery destroys individuals and steals their humanity. Douglass writes about feeling "dead" in spirit, and the loss of his identity under slavery.

* Knowledge as freedom: Douglass repeatedly emphasizes the power of education and knowledge in breaking the chains of slavery. He sees the act of learning as an escape from ignorance and oppression.

* The North Star as a beacon of hope: This iconic symbol represents freedom and the promise of a better life. Douglass uses the North Star to guide him physically and metaphorically toward his escape.

* The Underground Railroad as a path to liberation: The literal railroad, and the network of people who aided slaves in their flight to freedom, become a powerful metaphor for the journey toward self-determination.

It's important to note that Douglass's use of metaphor is not just a literary technique. He employs them strategically to expose the brutality and dehumanization of slavery, while simultaneously celebrating the resilience and yearning for freedom that characterizes the human spirit.