Abstract

The article introduces Marin Cureau de La Chambre’s theory of light, focusing especially on the treatise Le Lumière (1657). Specifically, the anti-Cartesian and anti-mechanistic side of Cureau’s work is stressed, reconstructing its account of the “essential” nature of light, linking it to the Franciscan and the Platonic tradition and focusing on the peculiar use of the notion of “extensio formalis.” Additionally, Cureau’s theory of color and his theories on irradiance and light’s movement is presented. Finally, the article illustrates Cureau’s qualitative explanation of refraction and reflection, reconstructing his role in the genesis of Fermat’s ‘principle of least time.’