Sol LeWitt's Dazzling Line Drawings

Sol LeWitt was the man who made conceptual art an appealing concept. For almost four decades, LeWitt, who died last year at 78, made immense abstract wall drawings that he conceived but almost never executed himself. His method was to devise a set of instructions — for instance, draw 10,000 ten-inch lines, covering the wall evenly — that could be carried out by assistants or, for that matter, by anyone. Often he never even saw the finished work, much less touched it.

This cerebral formula turned out to be a recipe for irresistible eye candy. Draw 10,000 ten-inch...