Before Walden's cabin came a Harvard student's shanty and a sister's letters from Cuba
Thoreau's famous cabin had a forerunner: a shanty at Flint's Pond where he spent six weeks in 1837. Even earlier, Sophia Peabody's letters from Cuba were read aloud at seven-hour parties in Boston. Transcendentalism, America's first home-grown philosophy, began as a hunger for spiritual intensity among Unitarian intellectuals.
The movement grew in New England in the late 1820s and 1830s. Its core faith held that people and nature are good at heart, that institutions such as churches and parties corrupt the individual, and that the divine shows itself in ordinary life. It did not rebel against Unitarianism, which had taken hold at Harvard after Henry Ware became divinity professor in 1805; rather, it ran parallel to it, craving a warmer experience than that church's calm rationalism.
It took organised form on September 12, 1836, when Emerson, Frederic Henry Hedge, George Putnam and others founded the Transcendental Club in Cambridge, Massachusetts. Margaret Fuller, Bronson Alcott, Elizabeth Peabody and Thoreau joined, and from 1840 their journal The Dial carried their work, including in 1844 the first English Lotus Sutra, rendered from French by Elizabeth Peabody. Most early members knew Kant and German idealism secondhand, through Coleridge, Carlyle and Madame de Stael. Indian scripture mattered too; in Walden Thoreau imagines the water of his pond mingling with the Ganges.
A central idea was the Over-Soul, a single divine being shared by all people, which reconciled fierce individualism with unity. Adherents split over what followed in practice. Orestes Brownson tied it to early socialism, while Emerson treated it as a purely personal and idealist project, admitting in an 1842 lecture that no pure transcendentalist had ever existed. In Nature he pictured himself dissolving into a transparent eyeball in the woods.
Sophia Peabody's 56 letters, written in Cuba in the early 1830s, came two years before Emerson's Nature and more than a decade before Walden. Charles Stearns Wheeler's shanty, used in Harvard summers from 1836 to 1842, is counted as the first outdoor living experiment, and Jeff Craig pinpointed its site in 2018 after five years of searching. Emerson sensed the movement fading by the late 1840s, especially once Fuller died in 1850, though a second wave followed.
Source: Transcendentalism