Autumn water is as traceless as a dream, and thoughts are boundless at the beginning of autumn is a poem. "Autumn water is as traceless as a dream" describes the autumn water surface as calm as a mirror, without ripples, and as blurry as a dream. The word "without trace" here refers to the absence of ripples on the water surface, and also implies that the passage of time leaves no trace, implying the silence and desolation of autumn. "Boundless Thoughts at the Beginning of Autumn" expresses the myriad and boundless thoughts of the poet at the Beginning of Autumn. The Beginning of Autumn is one of the twenty-four solar terms, marking the beginning of autumn. Poets use this season to express their inner emotions.