"Draw the curtain" means to close the window in Cantonese. Guangdong is a tropical maritime climate zone with long sunshine time, high temperature and high humidity. Therefore, many families use curtains on their windows to keep out the sun, avoid overheating and protect their privacy. When it is necessary to close the window, people will say "close the curtains".

In addition to family houses, many commercial places and public institutions also use curtains to decorate and manage the indoor environment. For example, hotels, hotel rooms often have curtains, which can be closed or opened at any time according to the needs of guests to meet different needs. At the same time, some offices, classrooms, libraries and other public places will also install curtains to protect privacy and provide a comfortable working and learning environment.

In recent years, with the progress of science and technology and people's pursuit of quality of life, more and more high-end residential and commercial buildings have begun to use intelligent curtain wall systems. This system can control the opening and closing of curtains through mobile phone or tablet computer, and at the same time, it can automatically sense environmental parameters such as temperature and humidity, and automatically adjust the state of curtains as needed. The appearance of intelligent curtain not only provides people with a more comfortable and convenient life experience, but also improves the intelligence of buildings and contributes to the sustainable development of the city.