I bring what you much need, yet always have,
Not money, amours, dress, eating, but as good;
I send no agent or medium, offer no representative
of value, but offer the value itself.
... lever, crank, axle, piston, shaft,
air-pump, boiler, beam, pulley, hinge, flange,
band, bolt, throttle, governors, up and down
rods.-- Walt Whitman, Leaves of Grass.