The traditional sculpture has been lost between not-architecture and not-landscape. Krauss divided this development into three stages. Firstly, the representative works, such as Rodin's Gates of Hell and the statue of Balzac, broke the practice of traditional monument scultpure, which released the traditional sculpture from the function of architecture, religion, ethics, literature and obtained the independence of the sculpture itself. Sculpture turned into the form of personal expression by artists themselves. This change also embodied the abandoning of traditional pedastal.
In the second stage is the modernist period and scupture entered the space of sitelessness or homelessness. The base became a part of the sculpture. The pedestal is designed as an abstract form and intergrated with the sculpture work. For example, in the work of Brancusi's Beginning of the world, the base tended toward radical abstractness which testifies to a loss of site.
In the third stage, sculpture turned into the form between architecture and landscape, which means that sculpture can't live without the environment and the background. Works of both Mary Miss and Robert Moriss embodied the importance of the unity of the work and the environment. The form of the work depended on the form of the background. The intention of the work was not to express the form of the work but the environment. Only when the environemt was fully expressed, then one can understand the form of the work. These are called environment or landscape sculpture.
Christo & Jeanne-Claude are very famous environment artists. They combined the landscape and the environment, wrapped up the architecture and the island and so on. In the work "Surrounded Island", the artists covered the island with 6.5 million square-feet pink fabric. The whole gulf looks like red flowers which are very beautiful. Though the physical meaning of the wrapping is temporary and short, the influence of work on the audience and the volunteer is timeless. I think it's hard to define what the sculpture is now. Actually the boundary between all the art forms are ambiguous. Since art acquires the cross-boundary to create the new life, it's hard to define the boundaries between Sculpture and Architecture, Sculpture and Landscape, Landscape and Architecture.