Book excerpt: Santayana at 150: International Interpretations is a collection of essays by seventeen authors celebrating the life and thought of Spanish–American philosopher George Santayana. This book appears on the occasion of the one hundred and fiftieth anniversary of Santayana’s birth. Appropriately, the authors come from both sides of the Atlantic and put forth a range of insights that demonstrate the continuing life and relevance of Santayana’s thinking. The book includes considerations of the major themes of his philosophy—materialism, naturalistic ethics, and aesthetics—and of the influence exerted on Santayana’s work by his life circumstances and geographic surroundings, especially of Rome.