Walden, or, Life in the Woods, is an American book written by noted transcendentalist Henry David Thoreau. The work is part personal declaration of independence, social experiment, voyage of spiritual discovery, satire, and manual for self-reliance. First published in 1854, Walden details Thoreau's experiences over the course of two years, two months, and two days in a cabin he built near Walden Pond, amidst woodland owned by his friend and mentor Ralph Waldo Emerson, near Concord, Massachusetts. Thoreau used this time to write his first book, A Week on the Concord and Merrimack Rivers. The experience later inspired Walden, in which Thoreau compresses the time into a single calendar year and uses passages of four seasons to symbolize human development. Published in 1854, it details Thoreau’s experiences over the course of two years in a cabin he built near Walden Pond, amid woodland owned by his friend and mentor Ralph Waldo Emerson, near Concord, Massachusetts.