Sol LeWitt  American (Hartford, Connecticut, 1928 - 2007, New
York City, New York)  Starting from the simple but radical new
idea that an artwork's concept is more important than its form,
Sol LeWitt helped revolutionize the definition of art in the
1960s. By the middle of that decade, LeWitt had rejected the
dominant, psychologically charged abstract style of artmaking
for impersonal, geometric forms. By repeating and varying a
single principle, he created sculptural structures that were
aesthetically satisfying even as their internal logic was pushed
to the edge of irrationality.  LeWitt's procedure of repetition
and variance is also the basis for his wall drawings. Each of
these impermanent artworks consists of a set of the artist's
instructions, something like a musical score, with the actual
execution carried out by someone else.  Over the years, LeWitt's
austere compositions gradually became more complex and sensuous,
though they remained true to his original precepts.