What significant shift occurred in modern sculpture after Picasso?

The significant shift in modern sculpture after Picasso primarily revolves around the construction of sculptures from found objects. Picasso's innovative approach, especially demonstrated in his masterpiece "Guitar" (1912), marked a departure from traditional sculptural practices. He began to incorporate everyday materials and objects into his work, which opened new avenues for artistic expression and challenged preconceived notions of what sculpture could be.

This method not only embraced the concept of collage and assemblage but also encouraged artists to explore the relationship between art and the ordinary world around them. The use of found objects allowed for greater creativity and accessibility, leading to an explosion of new styles and movements in sculpture, such as Dada and later, Pop Art. This practice became a hallmark of modernism, influencing countless artists in the decades that followed.

The other options, while related to transformations in art, do not capture the profound impact of Picasso’s work in the realm of sculpture. For instance, the introduction of traditional materials and techniques does not reflect the innovative, boundary-pushing spirit that characterized the post-Picasso era. Similarly, while abstract expressionism significantly influenced painting, its impact on sculpture was somewhat different and not as directly related to the shift initiated by Picasso. The idea of a return to naturalistic