The portion of the artwork with the head at top seems disjointed from the rest of the shredded portion (the original picture has normal human proportions).
So, it seems at least, that there may be two works of art.
One which remains unshredded and one which was already shredded (and was released by some mech). Whatever powered the light, likely powered the release mechanism for the shredded and unshredded works of art.
The "disjointedness" is probably due to the artwork being fed back and forth between some rollers. You can see a significant kink at the bottom of the shredded portion, probably due to it being stored pre-fed into the rollers. The rest of the shredded portion lies flat, suggesting that it has been stored flat -- and may be the original piece.
I find it curious, though, that the piece was made with such a significant lower margin hidden by the frame. It certainly suggests it was created for this stunt.
The portion of the artwork with the head at top seems disjointed from the rest of the shredded portion (the original picture has normal human proportions).
So, it seems at least, that there may be two works of art.
One which remains unshredded and one which was already shredded (and was released by some mech). Whatever powered the light, likely powered the release mechanism for the shredded and unshredded works of art.
If so, still remains an impressive stunt.