Detecting the colours of darkness

  title={Detecting the colours of darkness},
  author={Taco D Visser},
Every wave field is characterized by two numbers: a local amplitude and a phase. If the amplitude is zero at a certain location, the phase of the field will be indeterminate at that point. Such phase singularities, or vortices, are encountered in many different systems, and the movements of the tides provide a beautiful example. 

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