Sol LeWitt, Master of Conceptualism, Dies at 78
"He reduced art to a few of the most basic shapes (quadrilaterals, spheres, triangles), colors (red, yellow, blue, black) and types of lines, and organized them by guidelines he felt in the end free to bend. Much of what he devised came down to specific ideas or instructions: a thought you were meant to contemplate, or plans for drawings or actions that could be carried out by you, or not."
"Sometimes these plans derived from a logical system, like a game; sometimes they defied logic so that the results could not be foreseen, with instructions intentionally vague to allow for interpretation. Characteristically, he would then credit assistants or others with the results. With his wall drawing, mural-sized works that sometimes took teams of people weeks to execute, he might decide whether a line for which he had given the instruction “not straight” was sufficiently irregular without becoming wavy (and like many more traditional artists, he became more concerned in later years that his works look just the way he wished). But he always gave his team wiggle room, believing that the input of others — their joy, boredom, frustration or whatever — remained part of the art."