What is the philosophical significance of Bian's fish fossils?

On the surface, the meaning of this poem is very shallow and straight, but in fact it is very profound and obscure. Judging from the subtitle of the poem and some words in the text, it is easy for people to regard it as a love poem. It's actually a philosophical poem. The poet's confession can prove this. The poet once commented on this poem: "When a fish becomes a fossil, the fish is not the original fish, and the stone is not the original stone. This is also' life is easy'. Anyway, I'm not who I am today. We cherish the claws on the snow mud, which is a commemoration. " They seem to tell people that no matter what happened in your life and the beauty that happened, no matter how time and space change, they will still leave beautiful memories in your heart like clear paw prints on the snow and eternal fish fossils. So we can grasp the poetry of this poem from two levels: from a shallow level, this poem tells a past story through someone or a non-human creature. There are imagination and confusion about the past life, as well as nostalgia and nostalgia for the past. At a deeper level, what poets get from fish fossils is a historical and realistic philosophy, a philosophy of fishermen and self-pity. Fish fossils are inanimate, but poets treat them as spiritual creatures, talk to them, and even admire their unique "holding shape", and yearn for them: the eternal and gentle "waterline" will become eternal in the philosophical sense when "you" and "I" are far away and become history.