Large at least 20 feet metallic ball, blue grey (but it did change colors),like liquid metal, outside of my Mothers house just off the walk in the driveway all i know is i lapsed approx. 1 hour

I observed 1 ball-shaped object, approximatley 20 feet in size, usually blue-grey in color (but did change to other colors), hull looked like liquid metal texture.  I had gone outside ahead of the rest of my family, saw the object about 20 feet from me hovering about 10 feet off the ground, I stared at it for a few min. then I walked back into the house and my sister  asked me where I had been, that she had been looking for me for an hour.