Changing red and lime green orb seen in the western sky of Plainfield, IL.In the western sky, just after sunset, a bright lime green circular orb jettisoned into the sky at a rapid speed. It then sped in a horizontal direction across the sky, sometimes changing colors to a bright red. At other times, it would hover in one spot. Eventually it completely disappeared.About 3 minutes later, it approached the same area in the sky, but this time it came speeding from the south. It was flying both in a horizontal and vertical pattern at rapid speeds, all the time changing from bright red to lime green. Although this seems like it could be the red and green lights of any plane, the formation it moved and the color it changed were unlike a plane. Again, it would just hover at certain times and eventually it disappeared.While continuing to watch, a bright white light came out of the south. This appeared to be plane, as we have planes flying to Midway or O'Hare nightly. However this plane came speeding to the same area of the sky, circled the exact location of the changing orb and then sped off to the north.