Lol...sounds complicated.I myself dont completely know yet...
It is an old Japanese style of poetry they mostly used to write about seasons and nature....but now its changed people write about anything...and everything...
There is pattern though...three lines...seventeen syllables
1st line has 5 then 7 then 5!
Im not tht gud tll now...poets go on for days nd days over a specific poem. I just take a max of 20 mins, i dont even polish or go through the verses...its just a period where u want to vent ur feelings...nd it cms out in form of a poem.