The works that TONEYAMA Kojin (1921–1994), a painter with close ties to Setagaya, left in his studio reveal the vast extent of his field studies, always through an artist’s eye, of ancient sites and rituals in places as varied as Mexico, India, China, and the kofun tumuli of Japan. Since ancient times, people have used art to express their reverence for nature and the world of the spirit. Here we explore the diverse media—among them oil paintings, prints, and rubbings from Mayan and Aztec ruins—with which he gave form to the primordial energy he encountered in the course of his journeys.