Haiku tangent: I'm no Haiku master, but as I understand it a proper Haiku should succinctly convey the experience of a moment in time. That's really the hallmark of a Haiku. Use of "seasonal words" is a traditional, but not breaking requirement. And the 5-7-5 thing is somewhat misleading since the Japanese (rough) equivalent to a "syllable" is shorter than an English syllable such that a 5-7-5 Haiku in English tends to be ~30% longer in time taken to say than a Haiku in Japanese. (This is what I can recall off the top of my head from The Haiku Handbook. Which is much more worth reading than my comment if you're interested in Haiku.)

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