Final answer:
A freestanding sculpture is known as 'sculpture in the round' because it is fully viewable from all angles, unlike a relief sculpture which is attached to a background and less three-dimensional.
Step-by-step explanation:
A freestanding sculpture is also referred to as sculpture in the round because it can be viewed from all sides. This type of sculpture is distinct from a relief sculpture, which is only fully visible from one perspective as it is attached to a background. Sculpture in the round is designed to be walked around and appreciated from multiple angles, offering a complete, three-dimensional artistic experience. Such sculptures can often convey stronger senses of naturalism, as seen in the contrapposto stance, which adds to the lifelike quality of the figure, representing the ideals of Greek Humanism and the beauty of the human body. Further enhancing the immersive experience, the scale of large sculptures like Flamingo can be so great that viewers can walk under them, appreciating the artwork's immense size and the interplay with its surroundings.