What is Haiku?

Today we begin a weekly display of members’ responses to the question:
What is haiku? Our hope is that by sharing our responses (definitions,
descriptions, comments, or quotations of wise words by others) we will
achieve a broader and more sympathetic understanding of this poetry we
love.

Quendryth Young (Alstonville, NSW)

‘A haiku is a short poem of traditional Japanese origin which
captures the essence of a moment, finds the extraordinary in the
ordinary, and links nature to human nature.’

Kevin Sharpe (Blue Mountains, NSW) responds:

‘haiku, senryu : of the moment’

Nicholas Barwell (Perth, WA) endorses Harold Stewarts’s definition:

“Haiku try to express what Japanese call Mono No Aware, the
ah!ness of things: a feeling for natural loveliness tinged with a
sadness at its transience.”

Thanks to Quendryth, Kevin and Nicholas for sharing these.
Can you answer THE question in less than forty words.? Then please tell
John Bird at link removed He is is editing this feature for us.