Much as this is as beautiful and amazing an idea as article exults, one huge flaw has it being its own undoing. Kids at that age do not and should collaborate when it comes to artwork. While this may sound like pure skepticism, the entire collaborative effort was controlled and overseen by an adult - circles and only that in a 3d canvas of white surroundings. If you see in the earlier pictures where the white is still dominant, the child is arranging spirals and what looks like what they can of, a sun, flower, etc. And certainly a result more true to what one, as an adult, terms a collaborative effort.
Little less than a picture later (and perhaps about the same number of children in all's honesty), said individually unique forms are covered up by other children's in the same area, over and over. Leading to this explosion of color so favoured by children anyway. I can't help but wonder however, had each child been designated their own corner - the result might have been much different. One that reflects the artistic license that every human has, and the vat of imaginative capacity that a child can be.
Another thing I wonder is how exactly was this piece monitored and made? Specific number of circles per child? Fixed sets of individually sized circles? Random pickings from a box?
If anything, it's no different than a house painted by different hands. Which is a feat in itself since many hands make short work of a the larger, more time-consuming task by the self. Yet the result itself is no different. I hope they've got the video propped onto a (undecorated) large screen in the same room. For the true art piece is definitely the video of the entire time spawned process, in this case. One that is indeed, extremely awe-inspiring. I look forward to the waves it might make with other designers! Though it's been a while now - found this near the end of first half of the year..