Just let the artist sign an empty canvas or a frame, with the inscription, 'I had such and such a concept in mind' for this work. The artist then need not bother with producing the work, and therefore need not be worried about being dis-satisfied. All he or she needs to do is to sell it to a collector. The collector will have the guarantee that the artist thought about the work, even if momentarily, and therefore be satisfied.
Semir Zeki
