How do the spiral projectors or holograms work in Childish Gambino's SNL perform...

In Childish Gambino's SNL performance:

There are projectors of some sort that create (the illusion of?) cones of spirals and spiraling dots, lines, and surfaces.

They seem to be 3D, as in when he is standing in one of the cones, some lines pass in front of him, and some behind him. I do not think it is CGI, but I can't explain it with a usual projector with haze (even a cone-surface haze, however that would come to pass). You would still have to project light into it, which would light the haze up along a line until it hit something opaque (body, wall, floor...), lighting that up in a spot, too, so if you fired the light in from the side, the haze would be lit up all along the path of the light, as well as in the case where you fired from the peak of the cone.

Is this some high-tech two-photon setup where you fire two invisible wavelengths that have to intersect to produce a visible glow?

Is there some fast-rotating screen or string that's invisible in the haze?

Does it just look 3D and, in reality, is just a screen in front of the actors (made of gauze or haze) that is cleverly lighted?

This thread on Reddit somewhat explains the effect:

A very clever use of the camera frame rate, rolling shutter, and a CMOS censor, combined with timed projection. You would only be able to see this in camera, not live.

Another user adds:

The laser fixtures are KVANT Spectrums.

And I’m not an expert on camera work but I do work electrics for SNL on their remote shoots and occasionally in the studio so! ( worked on the friendo therapy music video this week )

I was told it was a camera / shutter sync to the lasers which were programmed to make those effects but only on camera. In the studio it just looked like solid beams. They of course used some atmospherics to make the light a bit more visible.

Really cool effect they achieved they had a guy who specializes in laser design / effects and programming come in just to do it.

The person who claims to have produced this effect also paid a visit:

My name is Joe Picard. I'm a DP, I invented this technique several years ago and refined it with the help of Adam Labay. That was our work on Saturday. I like to call it laser-banding. We've done it for a couple other projects and have done some other special work together as well.

You can see some other cool things at joepicard.com.

In another Reddit thread there is a longer explanation, though this explanation gives :

Those Lasers were designed by the companies Future Weapons, and Nice Lasers, they are both champions of lasers (check out Gareth emery’s laserface video on youtube for more of their work!).

The appearance of moving lines is a process of lining up the frame rate of the laser lines being drawn with the framerate of the camera. the bent lines is an occurance of Rolling Shutter used in video capture.

In person, you can't see that effect, it's only visible on a recording.

Heres how it works: If you project a line that sweeps back and forth 32 times times per second, with a camera that only captures one frame every 1/30th of a second, you will see a pattern that oscillates back and forth once every 15 seconds (32/30 = 1 with a reminder of 1/16, giving the 16 second effect). Lasers of course use much faster drawing paterns than 26 "lines" per second, and this can allow a range of cuncurrent timings, if you notice there were several paterns being thrown by the ceiling mounted fixture, you can see that the fixture was capable of outputting several paterns at once, because it can draw 50,000 points per second, with a vector between the points