I think it's a set-up.

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.