In Romanesque architecture, what element commonly separates the nave from the aisles in larger churches?

In Romanesque architecture, the element that commonly separates the nave from the aisles in larger churches is the arcade of columns. This architectural feature consists of a series of arches supported by columns, creating a visually distinctive and structurally supportive division between the central nave - which is typically wider and more impressive - and the lower aisles on either side.

The use of an arcade allowed for a more open space while still providing necessary support to the building, contributing to the characteristic robust and solid appearance of Romanesque churches. The design not only serves a functional purpose but also adds to the aesthetic quality of the space, encouraging a sense of height and grandeur, which is a hallmark of Romanesque style.

In contrast, crenelations, flying buttresses, and decorative moldings serve different architectural and decorative functions and are not primarily used to create a division between the nave and the aisles. Crenelations are more about fortification appearance, flying buttresses are associated with Gothic architecture for structural support, and decorative moldings enhance the visual appeal but do not serve the same dividing role as arcades.