John Chamberlain rose to prominence in the late 1950s with energetic, vibrant sculptures hewn from disused car parts, achieving a three-dimensional form of Abstract Expressionism that astounded critics and captured the imaginations of fellow artists. For a seven-year period in the mid-1960s, the artist abandoned automotive metal and turned to other materials. Motivated by scientific curiosity, Chamberlain produced sculptures in unorthodox media, such as urethene foam, galvanized steel, paper bags, mineral-coated Plexiglas and aluminum foil. Since returning in 1972 to metal as his primary material, Chamberlain limited himself to specific parts of the automobile, adding color to found car parts, dripping, spraying and patterning on top of existing hues to an often wild effect. In recent years, the artist has embarked on the production of a new body of work that demonstrates a decided return to earlier themes. John Chamberlain: Choices accompanies the Guggenheim Museum exhibition, which...