Scallop shells symbolise a christian religious thing
Michelangelo painted the ceiling of Sistine
cathedral ceilings follow the pitch of the roof, while vaulted don't necessarily do so.
The architectural term is "vault"; some call it a cathedral ceiling.
There is no standard.
A raked ceiling or cathedral ceiling is said to be better than a flat ceiling because of the echos in the rooms. It will really be up to the owner of the house and what they prefer.
Michelangelo is best known for his vast painting on the ceiling of the Sistine Chapel in the Vatican.
I think it is called a cathedral ceiling.
That would be the circular or oval ceiling of a large structure like a cathedral.
Michelangelo was said to be ambidextrous. So he may have used both hands when painting the Sistine Chapel ceiling.
The present building was started in 1112 and completed by about 1400, and has the longest uninterrupted vaulted ceiling in England.
Sir Christopher Wren this is the wrong answer - it was painted by Sir James Thornhill
Even if the ceiling is a cathedral, it is rarely the only point of interest in a room. Look the room over carefully, pick your focal wall from the architecture. A fireplace built in book shelves, or windows with a spectacular view should enter into the equation. If there are no architectural features, decide your furniture placement and pick you accent wall from that.