CONCORD, Mass. — The U.S. Postal Service is dedicating its new Henry David Thoreau postage stamp at a ceremony Tuesday at Walden Pond, where the 19th century American philosopher and naturalist spent two years in solitude and reflection.

Thoreau is being honored on the bicentennial year of his birth in Concord, Mass. The postal service says Thoreau’s way of living simply and rejecting materialism continues to inspire people.

The stamp image comes from an oil-on-panel painting of Thoreau’s face.