2 voiceless objects moving together and undulating as they moved.

The objects at first sight looked like 2 mylar balloons drifting over the house behind me, coming from behind a birch tree. It was a glint of metal that gave me that first impression. I was standing in the middle of the back yard when I saw the 2 objects approaching from the south. As they reached my yard they began to veer east and pass over my back yard directly in front of me about 100-150 feet above. It was at this point that I noticed that both objects were undulating and changing shape constantly. It was almost as if they were turning in on themselves over and over again. They had almost a jellyfish like quality. There was a haze around them, and a bluish/pinkish glow. As they passed they maintained the same speed and stayed the same distance apart. The most striking feature was that they looked alive. Almost like something swimming through the sky. My dog was in the corner of the yard and remained motionless the whole time. I lost sight of the objects as they passed over to the front of the house. At this point I gathered the dog to bring her in the house. I quickly grabbed my phone and headed to the front yard, but the objects were gone. The realization of what I saw made the hair stand up on my neck. It was in many ways terrifying as I was rather close to these objects.