Against Nature, also known as Against the Grain, is a novel by Joris-Karl Huysmans that epitomizes the decadent movement of the late 19th century. The protagonist, Jean des Esseintes, is a wealthy aristocrat who retreats from society to indulge in his own eccentric and decadent lifestyle. Huysmans' novel is a vivid portrayal of the fin-de-siècle ennui and the rejection of traditional values. Against Nature is a seminal work of decadent literature that explores themes of aestheticism, individualism, and the pursuit of pleasure.