I have been playing with water in my back yard. The incentive was to attract Hummingbirds, since they like to bathe in moving water.  But, while waiting for the hummingbirds to show up, I played around photographing the water. I shot most of the pictures in the late afternoon, about 5 pm or so.  At certain times, the water spray from the hose would catch the light just right and rainbows would form: It was always clear water on top, transitioning to red, then yellow, then blue, then purple.  I played around a lot with closeups and got some cool effects: After a while, the sun moved and the effect was over: Something I am curious about is why the lines are all dashes? All photos were taken between 1/10 and 1/13th of a second.  If you increase the shutter speed to 1/40th of a second, this is what you see: 1/100th: 1/400th: Then lastly, 1/1000th: So, all the water is just little droplets, but I would like to know why at 1/10th of a second, it appears to be dashed lines. Any thoughts??