Final answer:
The extended metaphor in Mark Twain's 'Life on the Mississippi' that encompasses the narrator's education is the process of learning to pilot a steamboat on the Mississippi River, symbolizing the journey of gaining knowledge and wisdom from real-life experiences.
Step-by-step explanation:
The extended metaphor that encompasses all of the narrator's education in Mark Twain's 'Life on the Mississippi' refers to the process of learning to pilot a steamboat on the Mississippi River. This metaphor is pivotal to the narrative, as it signifies not just the skill of navigating a complex and changing river but also the complexities of life's challenges. Twain's use of vivid imagery and detail allows readers to experience the sensory aspects of his journey, therefore enhancing their understanding of both the technicalities of river piloting and the broader reflections on life and society.
Twain's training under Mr. Bixby is an allegory for the broader education one gains in life, suggesting that expertise and wisdom come from hands-on experiences and adversities. This idea is further exemplified when considering the social context of the times, including references to slavery and societal norms. It is through the nuanced experiences and interactions on the river that Twain symbolically narrates his educational journey. The Mississippi River itself, with its beauty and perils, serves as a canvas for Twain's tales of personal growth and understanding of the world around him.