Painting: Rosenquist & Lichtenstein Are Alive

When the two pop artists first strode out upon the New York City art scene with their motley amalgams of commercial layouts, graphic devices and gigantic blowups, Rosenquist and Lichtenstein seemed as hard to tell apart as Hamlet's Rosencrantz and Guildenstern.

Since then, pop art has faded as a fad, but the two artists are far from dead; instead, each has emerged with a distinctive style, a commanding personality and a loyal following of his own.

Roy Lichtenstein, 44, the Leonardo of the funnies, has attracted 20,000 people in his first ten days at London's august Tate Gallery, where he is...