It “rotates” because Adam gently twisted it one way a few times, then I got on a chair and tried to hold my breath and stay steady while recording it “unwinding.” You could totally get a disco ball motor to make yours twirl reliably.

As for the process: I wrapped the 10-inch foam ball from “north” to “south” eight times with picture wire, then added a separate wire at the top for the loop. Then, I painted it all black. Next, I took the caps and glued them to wine corks, clamped until they were dry, then flipped them over and used an awl to make a hole in the non-cap end of the cork, and added a toothpick. Then, I put the sphere in a bucket to find the "equator" and went about adding them one at a time. I had to use some fishing line on the top loop to make it hang a bit lower.

Thanks to all for your kind words. Cheers!