I'd rather say an "open" quadrilogy.
In this case "open" means that the four seasons just don't follow each other during the same year: but in relation to particular times, significant places and specific situations of my personal existence.
Focusing on the usual spaces of my daily life to understand and transcend the sense of everything that's endless and repetitive.
Endless and repetitive as every living process on Earth:
dawn-day-sunset-night,
birth-growth-old age-death,
winter-spring-summer-fall.