Gothic architecture is a period in which stained glass became truly the heart of the arGothic stained glass marked the beginning of its true role as the heart of architecture. It was no longer merely decorative, but a key element defining the atmosphere, mood, and sacredness of an entire space. This era began around the 12th century in Europe and is closely associated with the construction of colossal cathedrals, which required "light" as a medium between humans and God. In m