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Rain (雨洗): Represents the cleansing of the spirit. Just as a summer downpour washes the dust from the leaves, life’s challenges serve to clear away our superficial ego and distractions.
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Wind (風磨): Represents the "buffing" or "honing" of character. Just as wind and sand smooth the jagged edges of a mountain over eons, the passage of time and the "winds of fate" refine a person’s inner strength and wisdom.
Together, they describe the beauty of a weathered soul. In Japanese aesthetics, this is closely tied to Wabi-sabi—finding perfection in imperfection and appreciating the marks left by time and nature.