Final answer:
The art piece above the stained glass rose window in the cathedral is called the Kings Gallery. It is located in the Chartres Cathedral in France and was created using the plate tracery technique.
Step-by-step explanation:
The art piece above the stained glass rose window in the cathedral is known as the Kings Gallery. It is located in the Chartres Cathedral in France. The technique used to create this piece is called plate tracery, which involves using stone to create openings for the stained glass windows.
The Kings Gallery is a typical feature of Gothic architecture, which became popular in the 13th century. During this period, the stone tracery that makes up the stained glass window becomes thinner and more complex, allowing for greater intricacy in the design.