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Poetry is statement of a series of equations, with numbers and symbols changing like the changes of mirrors, pools, skies, the only never-changing sign being the sign of infinity.

Carl Sandburg (2003). “The Complete Poems of Carl Sandburg”, p.318, Houghton Mifflin Harcourt
Poetry is statement of a series of equations, with numbers and symbols changing like the changes of mirrors, pools, skies, the only never-changing sign being the sign of infinity.