Fourth, Windows, one of the important part of Gothic architecture is tracery. The Gothic architectures cancelled a gallery, and increase the aisle windows. Such as the Notre-Dame Cathedral, the whole church with large window. The window was high and large, almost took on wall functions. The reasons are the buttress and save material. The church can have more space to get the sun into. The windows changes the church lighting, and the ideas is let the people will have a feeling of holy. This window ideas which change the Romanesque architecture due to insufficient daylight and dreary depressive sense. The tracery is given priority to with red, blue two colors, blue symbolize heaven, and red symbolizes the blood of
