The Natural Structure of Primes in Haiku

Mathematically we call it a geometric progression, that isn't necessarily easily spotted. I'll give you an example of a book. There's a book called The Luminaries by Eleanor Caton won the book of prize in 2013. And that book has a mathematical structure underneath it, which is that every chapter is half the length of the one before. So there are 14 lines in a sonnet. That's not prime. Well, it's seven couplets and two and seven prime. But with a sonnet, my feeling is it probably developed organically from smaller collections of lines. A quatrain four lines seems to be quite a natural thing in my book.