Art students can't tell grandmaster from animal.

Abstract art grandmasters score like class D amateurs

Hawley-Dolan and Winner had asked the art students to compare paintings by abstract artists with paintings made by a child or by an animal. In 67% of the cases, art students said that the painting by a renowned artist is better. I compare this with the winning probability of the chessplayers of different ratings. I conclude that the great artists score on the level of class D amateurs.

http://arxiv.org/abs/1106.1915