Indestructible waterproof material: You will never need another bookmark again – waterproof, tear resistant, will last forever as long as you use it as a bookmark. Unique Design: Each bookmark honors a philosopher with all their guiding wisdom. Size: 7 x 2 inches, not too big for the smallest paperback, not too small for the biggest hardcover. Henry David Thoreau was an American essayist, poet, and philosopher. A leading transcendentalist, Thoreau is best known for his book Walden, a reflection upon simple living in natural surroundings, and his essay "Civil Disobedience", an argument for disobedience to an unjust state.