To solve equations

            With an X that’s squared

            It sometimes takes

            A harking back

            To something that we know

            But isn’t clearly there

            Imagination of a certain kind

            Is necessary to derive

            Exactly what to place

            Upon the scales on either side

            However

            To divine a beauty

            Said to be incomparable

            Because the left-hand portion

            Balances upon the fulcrum

            Of an equal sign

            With what is right

            Demands the nerve 

            To contemplate 

            A pair of tiger eyes