In this episode, I discuss how the theory of beauty, or aesthetics, developed during the Enlightenment. Aesthetic judgement has to do with how we react to works of art and beauty in nature. I discuss how aesthetics in the Enlightenment tied aesthetic judgement to the rational structure in things. What is beautiful in art is what captures the unity in multiplicity, i.e. the universal rational structure that connects things that appear on the surface to be diverse.