Waning Moon (1960) is an early work that shows Amano already exploring the relationship between celestial bodies and the geometric forms that would increasingly define his practice. The waning moon — tsuki no kage ni naru — occupies a liminal position in Japanese poetic tradition, associated with endings, with the decline that precedes renewal, and with the particular beauty of incompleteness. Amano renders it with the formal clarity of his developing abstract vocabulary, the crescent or gibbous shape becoming a strong compositional element within a simplified nocturnal landscape.