Where have I been all these years? !!
For me 'Zen' covers most of the other possible choices: moment, lightness, omission, brevity, presence, ordinary language, awe...
Here is a review of the results as at March 2019:
Because the common perception is that Japanese haiku is defined by 1) its form of 5-7-5 Japanese letters, 2) traditional inclusion of a seasonal reference, and 3) a break or emotional pause (kire) to trigger the reader's imagination. What might be the corresponding three key features of our still-evolving English haiku, I wonder?
Please choose only three characteristics; and only submit once! Thanks for your kind cooperation.