I: Why Secondary Qualities are a Problem; 1. Why Direct Realism?; 2. General Exposition of the Problem of Secondary Qualities; 3. Why Direct Realism Needs Objective Secondary Qualities; II: How Thomas Reid Solves the Problem; 4. Primary and Secondary Qualities in Reid’s Theory of Perception; 5. Answering the Problem of Secondary Qualities; 6. Understanding Reid’s Distinction; III: Eight Objections with Replies; 7. Scientific Objections; 8. Philosophical Objections; 9. A Historical Objection; 10. Conclusion.