Final answer:
The nave elevation of a Western medieval church typically has three stories. Ely Cathedral is an example of a church where the composition of the nave bay is related to the vaulting system.
Step-by-step explanation:
In Western medieval churches, the nave elevation typically consists of three stories. The ground floor features the nave arcade with alternating piers. Above this is a gallery with double-light openings, and the third level is the clerestory with triplet openings. An example of a church where the composition of the nave bay is related structurally and visually to the system of vaulting is Ely Cathedral in England.