The answer is "a sculpture that has a relationship with its surroundings."
Environmental sculpture is sculpture that makes or modifies the earth for the watcher, instead of introducing itself figurally or fantastically before the watcher. A regular quality of bigger natural models is that one can really enter or go through the figure and be halfway or totally encompassed by it. Additionally, in a similar soul, it might be intended to create shadows or reflections, or to shading the light in the encompassing area.[