Photographs of small buildings in the air can be named castles in the air, flying houses, quiet years, that building, the sky and buildings. Photography refers to the process of recording images with some special equipment. Generally, we use mechanical cameras or digital cameras for photography. Sometimes photography is also called photography, that is, the process of exposing the photosensitive medium by the light emitted or reflected by the object. After photography is completed, the image information stored in the medium must be read by human eyes again through conversion. The specific method depends on the photosensitive means and medium characteristics. For film cameras, there will be chemical processes such as fixing, developing and enlarging. For digital cameras, the pictures need to be processed by computers and then output by other electronic devices.