Shape changing square/diamond UFO with circle lights that changed color. Flying very low.I noticed a very bright blinking light that looked pretty far away from where we were. As we watched it closer we realized there was 2 giant spotlights that looked like they were surveying the area. As soon as I pointed out the spot lights, they turned off. The object began moving faster while changing colors and then in the blink of an eye it began flying over us and changed shape into a more conventional looking aircraft but was still strange. It looked like a square/diamond shaped craft with circle lights on all four corners that were changing brightness and color. The object was flying very low and it was easy to determine that it was not an airplane of any sort. About a minute after observing the diamond shape aircraft it was out of sight