When I saw these videos, i was mind-blown to see the work of nature. How a force that causes the flow of hurricanes and cyclones also decides the flow of water in a pool!!
Check out these 2 videos from SmarterEveryDay and Veritasium...Try synchronizing the 2 vids for complete knowledge :P.
SmarterEveryDay : https://www.youtube.com/watch?v=aDorTBEhEtk
Veritasium : https://www.youtube.com/watch?v=ihv4f7VMeJw
DO see this amazing phenomenon! Cheers To Science!!