Why does the experience of form change as the viewer moves around a sculpture?

Because different surfaces are seen from different angles

The governing concept is three-dimensional form and viewpoint. A sculpture occupies real space, has height, width, and depth, and usually contains surfaces that face different directions. When the viewer moves, the line of sight changes; one side may become visible while another side is hidden, and the apparent silhouette, overlap, light, and shadow also change. Option A is correct because different angles reveal different surfaces of the same solid form. Option B is incorrect because a sculpture is not necessarily flat or made of paper. Option C is incorrect because movement changes the view, not the existence of the form. Option D is the opposite of the truth: depth is precisely what makes all-around viewing meaningful. This is why sculpture is experienced spatially rather than as a single fixed outline.

This is a Class 9 Art Education question. Chapter: Elements of Art. Topic: Form.