Firmly both: "In the event of a sale the Collector agrees to pay a sum equal to fifteen percent (15%) of the Appreciated Value (as hereinafter defined), if any, occasioned by such transfer or distribution or payment of insurance proceeds to the Artist (or Artist's agent for the purpose) within thirty days of the sale."

Coupled to the fact that this device continually tries to sell itself on ebay q7days, it's clearly designed to be a money making scheme for the artist. Surely, he would argue that this, too, is part of his art.