I was sitting on lower patio looking at trees in my yard when this football shaped object entered the yard to my right flying to my left in a u about 10 feet off the ground out the other side of the yard. It then reappeared over my pool about 40 feet off the ground stopped and remained still for a couple of seconds then out to the left again, still no sound. It was about 2.5 to 3 feet in length and about 1 foot in height in the middle, I couldn’t tell top from bottom, no lights no wings no tail, no markings and no sound. It’s color was light grayish blue like over cast sky. This wasn’t a drone, I have 2 DJI phantoms and the kids up the street have the Mavic type drone and you hear them before you see them. This thing was fast and Quiet.