Watsuji's Koji Junrei is a book of impressions of a trip he took in 1918 to Japan's ancient capital of Nara, where he saw a number of Buddhist temples. By then, Watsuji had already published influential, groundbreaking books on Nietzsche, Schopenhauer, Kierkegaard and the book Guzu saiko. This book began a modern literary trend of ""travel writing"" about ancient temples and shrines.