spray from a sea wall rainbow —Martin Gottlieb Cohen
Here's a haiga by Kuniharu Shimizu based on this haiku. See Shimuzu's haiga gallery, "see haiku here."
Martin's notes:
I was aboard a destroyer and we were at a Copenhagen pier. This was 1969 and there were protesters on the pier with placards denouncing the US involvement in the Viet Nam War. Some protesters were in row boats near our ship chanting HO, HO, HO CHI MIN! HO, HO, HO CHI MIN! Then, they started to throw stones at us. I was inside the pilot house and lucky to have missed standing the quarter deck watch. The commander was afraid of an incident and gave the order to steam out of the port. As the ship slowly left the pier, it passed a breaker and I saw the spray from a wave splashing on the breaker make a little rainbow. I never saw that before or since and it stuck with me.

capped red fire hydrant
steam from streams of yellow ...
the dog on three legs
A Triumphal Arch!
The pidgins fly again
under the rainbow
autumn twilight
dawn's late --
my head's low