Which type of transformation is observed in the door tracery of Reims Cathedral?

The door tracery of Reims Cathedral exhibits a subtractive transformation. This refers to a design approach where material is removed to create intricate patterns and openings in the stonework. The intricate tracery seen in Cathedral architecture typically involves cutting away sections of masonry to achieve a delicate effect, allowing light to filter through while maintaining structural integrity.

In the context of Reims Cathedral, the door tracery features complex designs that are achieved through this subtractive method, showcasing how the removal of material can form decorative elements and enhance the visual appeal of architectural features. This transformation method is essential in Gothic architecture, where the interplay of light and shadow is a crucial aspect of the overall aesthetic, emphasizing the spiritual and ethereal qualities intended by the designers.

Other types of transformations, such as dimensional, additive, and multitude transformations, do not accurately describe the processes involved in the creation of door tracery in this case, as they pertain to different design techniques and principles not primarily used in the context of this specific architectural style.