Explore the fascinating world of color perception in this 37-minute lecture from The Royal Institution. Delve into the physics of light and the psychology of human vision as Andrew Hanson, former Chairman of the Colour Group of Great Britain, presents engaging demonstrations and optical illusions. Discover how color measurement impacts various fields, from plant evaluation to display calibration. Learn about spectral reflectance, visual response, and color constancy while gaining insights into the complexities of human color perception. Uncover the science behind phenomena like "The Dress" illusion and understand how color influences our daily lives, from consumer choices to safety warnings.