I was standing on my patio facing south, when I noticed two objects in the air moving towards my location. I thought they were helicopters as they approached but there was no engine noise. As they passed over my house to the north-east, the first one rose into the cloud cover and disappeared. The second who was following on the same course then did the same thing. I took photographs and have two houses in the picture for a reference. They stayed at approximately 4 to 5 hundred feet, moving silently. Event was over very quickly. The objects appeared to pulsate and change shape and even change shades of color.