I thought I fully understood the notion of square waves. Not so!  Here are real square waves. (Photo taken off the coast of the French island Isle of Rhe.)

Amazing!

Wow... any idea how they form?  

And here is the reason! 

http://www.lifeaspire.com/7342/the-cause-of-square...

Very interesting indeed. 

Interference pattern... cool!   Since you are doing so well, now explain this hexagon at the north pole of Saturn

Google is your friend ! :) 

https://en.wikipedia.org/wiki/Saturn%27s_hexagon

Nature is a magnificent math creation!