Donald,
With the possible exception of photographs of specimens for scientific study, aren't most photographs an interpretation of a scene? The photographer chooses parameters (focal length, exposure, DOF, point of view, etc) to reflect his/her interpretation. I am relatively new to photography and I can see how dark or light or opened or cluttered etc would influence the mood of a photo but I can't think of any mood, atmosphere or tension that would be enhanced by purposefully creating an entirely out of focus photo.
André