Recipe for making symmetrical holes in water is easy.
As a bucket of water speeds up, the hole changes shape from a three-sided star to a pentagon.
Credit: Credit T.R.N. Jansson
References
JanssonT. R. N., et al. Phys. Rev. Lett., 96. 174502 (2006).
LewisB. M.& HawkinsH. F. Bull. Am. Met. Soc., 63. 1294 - 1301 (1982).
GodfreyD. A., et al. Icarus, 76. 335 - 356 (1988).
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Ball, P. Geometric whirlpools revealed. Nature (2006). https://doi.org/10.1038/news060515-17
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DOI: https://doi.org/10.1038/news060515-17
