“You can feast on Sol LeWitt. The drawings he produced are mentally delicious. What makes them so delicious, so pleasing to the mind, is that he didn’t have to draw them. That’s because the artist, who died at age 78 on Sunday, employed what one might call the conceptual cookbook method. Each of LeWitt’s drawings came with its own recipe. The rest was up to you. If you followed the directions, you could cook it up yourself.”