Five syllable line,
A seven syllable line,
And five syllables.
Traditionally, the last line of the haiku will contain a "link to the eternal" or a seasonal reference. In Japanese, this will usually be done with one word.
Good haiku will grab the reader or hearer's imagination and will cause them to reflect on far more than you'd think you could get in seventeen syllables.
I think Kenneth Yasuda described it best when he said:
When one happens to see a beautiful sunset or lovely flower, for instance, one is often so delighted that one merely stands still. That state of mind might be called "ah-ness", for the beholder can only give one breath-long exclamation of delight: "Ah!" The object has seized him and he is aware only of the shapes, the colors, the shadows.... The is here no time or place explicitly for reflection for judgements, or for the observer's feelings.... To render such a moment is the intent of all haiku, and the discipline of the form.
- Haiku by Friends
- Haiku by Dave
- Roulette Haiku, 1995
- On Meeting Tara, 1996
- "I'm Sorry" flowers, 1997