Christopher Vogler The Writers Journey
them together, so strong is the force of repulsion.
Among the curious properties of electrical and magnetic fields is the fact that
the polarity of these systems can abruptly reverse itself. T h e direction the energy
is flowing in alternating current electrical systems flips back and forth from posi
tive to negative fifty or sixty times a second, while the magnetic fields of heavenly
bodies reverse polarity infrequendy but on some mysterious timetable. For reasons
that are poorly understood, the giant magnetic field of the sun reverses its polarity
every eleven years or so, generating immense storms of radiation that wash over the
earth like invisible tsunamis and disrupt communications and electronics worldwide.
Scientists believe the magnetic field of the Earth has flipped poles many times over
thousands of years, presumably making magnets and compasses point south for
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