Item d of article 9.2.2 of Code for Design of Primary and Secondary Schools (GB 50099-20 1 1) stipulates that the light from the left side of students' seats should be the main light in ordinary classrooms, science classrooms, laboratories, special classrooms for history and geography, computers, languages, fine arts and calligraphy, combined classrooms and libraries. When the classroom is arranged in the south corridor, the north window should be the main lighting surface. Item A of Article 5.7.6 stipulates that the walls and ceilings of art classrooms should be white. Item 5. 1. 1 of item B stipulates that bright windows should be provided at the doors of all kinds of classrooms except music classrooms. 5. Paragraph 2 (c) of Article1.9 stipulates that the window glass of the teaching room and the teaching auxiliary room shall meet the teaching requirements, and colored glass shall not be used.