Modern sculpture has the following characteristics:

1. **Diversity and Experimentation**: Modern sculpture is not limited to traditional materials and forms. Artists often use various new materials (such as plastic, metal, glass, etc.) and technologies (such as 3D printing, installation art, etc.) to create and explore new ways of expression.

2. **Abstract and Non-figurative**: Many modern sculptures tend to be abstract, emphasizing the relationship between shape, line and space, and no longer pursuing the true reproduction of real objects. This non-figurative expression allows the audience to understand the work from different angles.

3. **Interactivity**: Modern sculptures often encourage audience participation and interaction. Many works are designed to be touchable, movable or changeable, making the audience not only an observer, but also a part of the creation.

4. **Social and Political Themes**: Modern sculptures often reflect social, political and cultural issues. Artists express their views on contemporary issues through sculptures, which triggers the audience's thinking and discussion.

5. **Environment and Space Relationship**: Modern sculptures focus on the relationship with the surrounding environment. Many works are designed to blend with specific spaces or natural environments, emphasizing the experience and perception of space.

6. **Conceptuality**: Modern sculptures often emphasize concepts and ideas. Artists convey specific ideas or emotions through their works, rather than just pursuing visual beauty.

These characteristics make modern sculptures more diverse in artistic expression and better reflect the complexity and diversity of contemporary society.