INTERPENETRATING MOULDINGS, in architecture, are mouldings of the same or different profiles, which meet at an angle, as at the top of an arch or the corner of an opening, and instead of stopping at the line of intersection, are carved as though they passed through each other and continued on until received by some projecting member or surface. Such a juncture
is known as an interpenetration. This treatment is characteristic of flamboyant Gothic (see FLAMBOYANT STYLE), especially in France and Germany.