On the other hand, there are drones that can look like a solid sphere.
But the simplest explanation is that this is the old model and fishing pole trick. If you have multiple string attachments and move carefully, the wobbly motion and swaying can be minimized. A spherical model would also tend to minimize wobble. Much better than a pie plate.
That's the explanation I think is most likely.
^^^ Sorry, I'm still trying to figure out the best/easiest way to post video clips on this forum. Any tips? The Twitter and Imgur video viewers are not working very well. Not sure if I'm doing something wrong or there is incompatibility with the forum and those viewers.
Here's lower quality gifs (short exerts from my above post) that I'm hoping will play properly through the forum software:
If you watch the full 2:10 video, the flashing is very momentary and random throughout. Like the skyline is empty of these lights throughout the video besides them monetarily popping up in random locations in the sky for a half second or a second. Definitely not any sort of standard FAA adherent lighting/signaling. These are very sharp, high frequency colored flashes that have rapidly changing spatial distributions. I do understand what you mean by this potentially being accounted for by an object that is rotating with respect to our field of view. I wish the original footage was better quality.The blinking light seems to travel along, then show down to a near-stationary position. At the same time the light goes from red to white, and gets more faint. It would appear to be turning away from the camera in a way that obscures the red light. Helicopter?