In Celtic legends, the creature that symbolizes the importance of cycles is the snake, particularly in the form of the serpent or dragon. These creatures often represent the continuity of life, transformation, and renewal, mirroring the natural rhythms of life and death. The cyclical nature portrayed through these symbols emphasizes the interconnectedness of all life and the eternal return of the seasons, which resonates profoundly in the Celtic worldview and its appreciation of nature's patterns.