My wife and I were sitting on the grass in the park overlooking the water of Lake Michigan at Montrose Harbor facing East. The sky was fairly clear. Some clouds in the distance. We are familiar with the area. There is considerable air traffic into O'Hare airport. We saw three spherical silver shining orbs in formation traveling West to East below the typical airplane flight path elevation. They were traveling quite faster than typical commercial aircraft. I pointed them out to my wife. She saw them as well. They disappeared into the distant cloud formation to the east. This happened approximately 6:20 p.m. on May 1, 2021. Weather was clear and sunny. Approximately 3 to 5 minutes after we observed this event, I saw another single spherical silver shining object traveling in the same direction. This object was just as fast as the others. There was no sound coming from the objects. The formation they held and speed was incredible.