Well I mean you can't have rules without a police force, can you, and since there's no poets' union from which you could be expelled, clearly whether there are any rules depends entirely on the poets themselves and their readers, and everybody knows that until about the end of the nineteenth century almost all poetry was written in regular metre and regular patterns and, except for blank verse, in regular rhyme, and that this is no longer so and now you would either be deliberately old fashioned or you would have some special purpose, I think, if you wrote your poems in traditional rhyming schemes.