What are the motifs in Once Again I Prove the Theory of Relativity by Sandra Cisneros?

The last two lines of the poem suggest that love is the fuel of art and creativity. The memory of a love so deeply felt, absorbed into the fibers of the lover's being, even if the desired relationship does not last, will inspire her to write poetry. Or perhaps it would be truer to say that it is the loss of love that will inspire her. It is, after all, the loss of her love and her hopes for his return that has inspired the entire poem. So, underlying the tribute to love is perhaps a sadder reality. Love may not endure in the flesh, but it can be transformed into art.