Jay Friedenberg was one of the finalists with the following one-line haiku. Here are some questions he answered about his poem and process:
poppy field all I see is red
I was thinking about all the anger and rage existing in the world now and how because of this people are unable to see the beauty that is right in front of them.
This one more or less came to me in a flash. I wrote down several versions and was dissatisfied with them. Then after some mulling, it popped right out. I do have a set procedure for writing that consists of reading or observation followed by drafts. I will typically leave a poem alone for a while and then come back to it a few days or weeks later. This waiting process really pays off. Oftentimes one can see exactly what is wrong with a haiku or what changes or need on this second pass.
This particular haiku started off as a three-liner but upon retrospection it seemed too wordy. Converting to the single-line format improved things significantly. The horizontality of the monoku emphasizes the field and also the rushed impatience of the observer.
I am a big fan of one-line poems. They are in many cases more direct and memorable because they impose less of a cognitive processing load on the reader. They still allow for juxtaposition but the comparison between images takes place rapidly. The linearity fits certain subject matters more, for example, those that emphasize speed or motion.
There is a visual analog between panoramic images and one-line haiku. They take in a greater spatial expanse, causing the observer to mentally scan across them. I think it would be great to have a new style of haiga that would consist of pairing these together.