The more that I have had an active part in increasing the number of haiku being created, the more I have come to know that haiku cannot be defined. Over the years many have tried to define haiku but, as more and more gifted individuals bring their skills to this verse form, that which makes haiku distinct from other verse forms will not be fenced in.  Haiku's distinct identity is recognised not by scansion, layout, vocabulary etc. but by the way it works on us as we read it.