When authorship starts to get blurred by random
interventions (and anything outside the author's
control is somehow random) I always remember the
Elephant Art Gallery (www.soarts.com/elephantart).
Is that on the same level as a Pollock? :-)
a) no because the elephant is a naif whereas pollock is clearly part
of a specific high culture tradition
b) the question presupposes an anthropomorphic validation of art,
intentionality, and identity. your question only works if we assume
it makes sense *for* the elephant. it probably doesn't.