________ signs are painted on or attached flush with a structural wall.

Wall signs are specifically designed to be painted on or attached flush with a structural wall. This type of signage is typically used for branding, directional, or informational purposes and is integrated into the architecture of the building itself. By being flush with the wall, these signs promote a clean and cohesive appearance, which can be important for aesthetic and functional reasons in both commercial and residential settings.

In contrast, projecting signs extend outward from the wall, which differentiates them from wall signs. Mansard signs refer to those that are mounted on the roof or facade structure of buildings, and window signs are placed on glass surfaces, making them distinct as well. Each sign type serves unique purposes and adheres to specific regulations concerning placement and visibility, reinforcing the distinction between wall signs and other signage types.