What is the element that articulates forms and refers to the line along which two surfaces meet?

The correct answer is "Edge" because it specifically describes the intersection of two surfaces where they meet, creating a line that is a crucial element in understanding three-dimensional forms in architecture and design. The edge serves as a critical point of delineation that not only defines the boundary of objects but also contributes to the overall aesthetic and structural qualities of a design. This concept is fundamental in both theoretical and practical aspects of architecture, as edges influence the perception of form, space, and materiality.

In contrast, while "Surface" refers to the two-dimensional aspect of objects, it does not specifically denote the line that articulates the connection between them. "Position" pertains to the placement or arrangement of a form within a space, which does not directly relate to how surfaces interact with each other. Similarly, "Orientation" refers to the alignment or direction of a form but does not capture the specific interaction point where two surfaces converge. Therefore, "Edge" remains the most precise term to describe the articulating line created by two intersecting surfaces.