Flying orb or sphere that changes colors and physical form.

We were on our rooftop when we saw a bright light in the west horizon. This light moved slowly similar to a plane. My girlfriend asked what it was and I initially told her a plane. The bright light moved from west to east across the city skyline to the north. It continued across to our south east when we took notice that it was not a helicopter or drone and definitely not a plane. Three things we see a lot of from our deck. It didn’t have any sound but was close enough to mistake as a drone but far enough that you couldn’t make out a shape, other than the round sphere it was. Inside there were many colors ranging from green to purple to and deep blues to magenta even. This is when I started filming the object. Then the sphere changed forms to a gas, like a white smoke, circular in shape but not symmetrical boarders. Then back to a smaller sphere with color patterns on the inside. When I went to show my girlfriend the video I took. We both looked down for about 3 seconds at the phone and looked back up. Sure enough the light sphere was gone.
I have a minute video of this.