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I was outside playing with my son on our deck, and noticed a dark shape hovering about a mile south, I went inside to grab one of my cameras and shoot it. However when I went to photograph it I could see it in the view finder but it didn't appear after taking several shots. Soon after that I watched it almost jump over to redwood city, than I went back into my house to grab another camera and was able to take several photos of the object before it vanished.