Modern Japanese thought is strongly influenced by Western science and philosophy. Japan's rapid modernization was partly aided by the early study of western science (known as Rangaku) during the Edo Period (1603–1868). Another intellectual movement during the Edo period was Kokugaku (national study), which sought to focus on the study of ancient Japanese thought, classic texts, and culture over and against foreign Chinese and Buddhist cultures. A key figure of this movement is Motoori Norinaga (1730–1801), who argued that the essence of classic Japanese literature and culture was a sense called mono no aware ("sorrow at evanescence").