Although Romanesque and Gothic periods both used the Latin Cross as a base for their cathedrals, and shared features like westworks, arches, and buttresses, they differed greatly in the details of those features. A significant difference between the two is the massiveness of the Romanesque compared to the tall, thin, ornateness of gothic architecture. Romanesque buildings convey strength with thick walls (and flat, thick buttresses), simple westwork features, and rounded arches and windows. Gothic features included thin, pointed arches and windows, stained glass, flying buttresses to give an illusion of lightness, and westworks decorated with ornate tympanums, archivolts, and trumeau.