There was a question about whether special cameras are needed.
https://water.lsbu.ac.uk/water/martin_chaplin.html
https://www.youtube.com/watch?v=7ElEiDdL73w
More on mosaic patterns in water
https://water.lsbu.ac.uk/water/martin_chaplin.html
https://www.youtube.com/watch?v=7ElEiDdL73w