Sometimes you want blur. It implies motion. If you stop the action with a fast shutter speed, it’s great. But you may in fact want the image blurred. There is a fine line between out of focus and making a point. One is technical understanding of your equipment and the other is serendipity. On this image taken many years ago with a manual camera and slide film, serendipity was the order of the day. I had no clue [no LCD screen] as to what I got until long after I was gone to have the film developed.