The ceiling is the place on the top surface of a building's interior. In interior design, the ceiling can be painted and painted to beautify the indoor environment and install chandeliers, light pipes, ceiling fans, open skylights, install air conditioning, and change the effect of indoor lighting and air circulation. It is the general term for decorative indoor roofing materials. In the past, traditional dwellings mostly used straw mats, reed mats, and wooden boards as the main materials. With the advancement of science and technology, more modern building materials are applied.