What term describes a volume defined by vertical planes that afford visual and spatial continuity?

The term that describes a volume defined by vertical planes that afford visual and spatial continuity is best represented by the U-shaped plane. This configuration relates to how spaces are organized to create openness and connectivity, allowing for a harmonious flow between different areas.

The U-shape forms a spatial boundary that guides movement and perception, encouraging interaction with the surrounding environment. This design strategy can be observed in various architectural contexts, where the shape itself fosters a sense of enclosure while still maintaining a relationship to the outside space.

In contrast, the other choices do not effectively capture the essence of a volume defined by vertical planes in a way that promotes continuity. For instance, L-shaped and parallel planes can create distinct zones without the same level of interconnectedness. Inward-facing planes imply a more enclosed, inward focus, which contradicts the idea of visual and spatial continuity that the U-shaped form encapsulates.