Final answer:
The sculpture technique more commonly used by modern artists is assemblage, a method of combining various objects to create art, which differs from traditional techniques like carving or modeling.
Step-by-step explanation:
The sculpture technique that is more commonly used by modern artists than by artists in the past is assemblage. Unlike traditional methods like carving that involve the subtractive process of removing material from a larger mass, assemblage is a technique where artists create works by combining various objects.
These objects can be found, manufactured, or altered, and are often assembled using methods like welding, gluing, and bolting. Duchamp's Readymades and Rauschenberg's Combines are historical examples that paved the way for this method.
Contemporary artists use assemblage not only to create new forms but also to introduce theoretical concepts within their artworks. Jessica Stockholder is one such artist who employs this technique in her works.
On the other hand, methods like modeling, casting, and carving have long traditions, and while still used today, they do not uniquely define modern sculpture as assemblage does.