Thanks, TW, I appreciate the answer. I know my parents got quite into haiku writing a few years back, encouraged or at least inspired by conversation with some Japanese friends; I think I shall enquire more of them, they are usually pretty thorough about researching things! Also will ask a Japanese friend of mine who is a student of the tea ceremony, which covers just about everthing to do with traditional Japanese art and culture (not just making tea!). Will let you know what I learn if you are interested? (and no, I do not believe you are supposed to join them together, but it works well!)