Does the dome have some sort of purpose? For example, as an engineer, if the dome was the wall of a building and provided more space inside for less material th

Does the dome have some sort of purpose? For example, as an engineer, if the dome was the wall of a building and provided more space inside for less material that would be awesome. As it is, it just seems like a useless art display and waste of material since the building inside is exactly the same as it would be without it.