Ceiling is the upper interior surface that is related to the top of a room. Generally, the ceiling is not a structural element, but a surface covering the floor of the roof structure above. The cathedral ceiling is a long ceiling area similar to that in the church.
The ceiling is often decorated with frescoes, mosaic tiles and other surface treatments. If it's hard to decorate (at least in situ), the ceiling decoration is protected from damage by fingers and dust.
In this application you can find ceiling design ideas that you like.