Also, in the above photo, notice the top of the streetlamps; during WWII in Los Angeles, the tops of streetlamps were blacked out to dim the lights from above, because of the fear that the Japanese were going to attack the west coast of the US at night (as if they still wouldn't be able to see the lit streetlights anyway). And if you watch the film noir "Double Indemnity," which was released in 1944, you'll see in the night scenes outside that the streetlamps were blacked out on top.