Maxwell's fishpond

@article{Kinsler2012MaxwellsF,
  title={Maxwell's fishpond},
  author={Paul Kinsler and Jiajun Tan and Timothy Thio and Claire F Trant and Navin Kandapper},
  journal={European Journal of Physics},
  year={2012},
  volume={33},
  pages={1737 - 1750}
}
Most of us will have at some time thrown a pebble into water, and watched the ripples spread outwards and fade away. But now there is also a way to reverse the process, and make those ripples turn around and reconverge again, …and again, and again. To do this we have designed the Maxwell's fishpond, a water wave or ‘transformation aquatics’ version of the Maxwell's fisheye lens (Tyc et al 2011 New J. Phys. 13 115004; Luneburg 1964 Mathematical Theory of Optics). These are transformation devices… 
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