The question is in this reply to a haiku poet that suggested avoiding imaginary haiku:

This is fascinating. You are the second person to mention that the haiku writer should avoid the sole use of imagination and use direct experience. You called it faction and another poet called it fictional haiku. Half of my attempts use indirect experiences the other half by immediate ones. I have never made a haiku attempt from only my imagination but I think that I might try it. I contend there is no such thing as abstract or purely imagined experiences. When anyone tries to make a haiku in that way, he or she can only use his or her direct or indirect primary or secondary experiences. When they use their imagination, it is a procreative effort. We gather bits and pieces of second hand information that we acquired in our lives in all sorts of ways. I have never killed anyone and don