Love, a writer in Taiwan Province Province, wrote a poem, "The shoe print on the left is only afternoon, and the shoe print on the right is dusk." How to understand?

Please look at the ending, "Your eyes that used to be called clouds are now called smoke". What is cloud smoke and what is fleeting cloud smoke? My QQ name is "Life has been decades, and I think life is really like a flash film. The truest flash is to grasp the present moment, pass the world in a hurry, and teach us to cherish it.