I saw 6 spherical objects, silver or chrome in color. They were circling around eachother very close and at a high rate of speed.

I looked up in the sky at around 4:00pm, and towards the west, I observed 6 or 7 spherical objects moving north in a tight cluster. They looked very small, though it was hard to tell because I'm not sure how far away they were. They were circling or"dancing" around eachother in a very tight formation, and at a very high rate of speed. It appeared to be some kind of figure 8 pattern they were making around eachother. Then, they just kind of disappeared, one at a time. It was a clear blue sky in broad daylight. That was the background. My girlfriend also witnessed the event. I called to her to come & look, because at first I thought it was a smudge on my sunglasses, or my contact lense. Then I realized that smudges don't move and pulsate like that. We tried to think of anything we could that would identify what we saw, but, we knew it was something that could not be identified. Anything man has made would've crashed doing what they were doing. I'm surprised they DIDN'T crash!