This is a variation of various illuminated dance costumes that have been around for a while.
The music the dancers preformed to would be linked to a program that would illuminate a series of LEDs on their black costumes. The stage would be dark so the LEDs could be easily seen when illuminated.
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LEDs would receive their triggering information through radio receivers on the dancer's belts and the sequences would be integrally linked to the dancer's moves. If for instance, at beat 4 at 2:15 in the program the dancer waved their arm over their head, they'd "write" a word or pattern with their arm. It would be the same as those LED pendulum clocks that present an image of the time by lighting up the various LEDs at different positions in the pendulum's arc.
So if the dancer ran across the stage fast enough,they could present a picture of a, I don't know, smily face or something. They could present words, pictures or just abstract patterns that would flash on the stage only just long enough to be perceived.
I should probably come up with a better example. Ok, they all line up and wave their arms in sequence over their heads and the lights form a bird flying across the stage.
Hey, I'd be technical consultant, not choreographer.
It would be dancing in 4 dimensions. Depth, width, height and time. If you don't hit your mark, the picture doesn't appear, you're just standing there with a bunch of randomly blinking lights. But if it's done right, you should be able to put on a pretty dramatic display of dance linked with a serial motion light show.