A friend of Rousseau, Diderot was an Enlightenment writer and Philosopher. Diderot's other works spanned a wide range of genres, including novels, scientific treatises, and art criticism. His novel "Jacques the Fatalist" explores themes of determinism and free will, while "Rameau's Nephew" is a dialogic exploration of moral relativism and the nature of genius. In his art criticism, notably his writings on the Salons (the official art exhibitions in Paris), Diderot was pioneering, blending detailed descriptions with broader philosophical reflections on art and aesthetics.