The essay by Henry David Thoreau in which he makes more elaborate use of metaphor is "Walden, or, Life in the Woods" (1854).
In this essay, Thoreau uses more elaborate metaphor to convey the ideas of nonindividuality and to show how the human mind is easily influenced as the Earth's soil is marked by the steps of others.
The way in which he describes and metaphorizes nature and human existance in the space of Walden Pond contributes to adapt complex and abstract ideas of humanistic guidance into understandable language.