You can see it here at 9m50s:
https://youtu.be/7Xnr805bm4E?feature=shared&t=590
It's just a single animated strip, one pixel wide. I assume the camera array is on the opposite side.
https://www.youtube.com/watch?v=tcxyXnPIF4o#t=2m45s
(You can see it in normal speed too, but I can feel the formation of shapes better in the slow-mo, instead of it just feeling like blinking)
I've been told by several Gen-Z that they've never been to a "rave", and I feel sorry for them. In my town, we had quite the underground scene, but then times changed and it is so much smaller now. Now, "kids" just call it all EDM instead of the specific genre that we know and love.
I don't think there were any available in my hometown (or they were too underground for me to have ever heard about!), and there wasn't much exposure to electronic music at all, so it's not an experience I'd ever considered trying to find out how to have.
Just one person's anecdote, of course, but I wonder what the balance of generation vs. location is!