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. Aristotle was a Greek philosopher during the Classical period in Ancient Greece, the founder of the Lyceum and the Peripatetic school of philosophy and Aristotelian tradition. Along with his teacher Plato, he has been called the "Father of Western Philosophy."