Lucas H. answered 07/12/24
Dedicated tutor with industry experience
Let's assume we're discussing Gothic architecture, as part of your question refers to a "clerestory". In Gothic architecture, a gallery and a clerestory are similar, but I wouldn't say any of the options are technically correct. Both a gallery and a clerestory are upper parts of the construction of the vault -- the main ceiling of the church. As Gothic architects got more advanced in their skill, they were able to increase the height of the vault, adding additional storeys. The clerestory is a description of an upper part of the walls of the main vault that often had a lot of windows, which allowed light to come in.