For a family, no one likes their own actions in the eyes of others. From this point of view, different indoor areas have different standards for privacy concerns. The public activity area of family members such as the living room has lower requirements for privacy. Most of the family living rooms open the curtains, and in most cases are decorated. For the bedroom, the restroom, etc., people not only can't see it, but they can't even see the shadow. This has caused different problems in the choice of curtains in different areas. In the living room we may choose a fabric that is translucent, while the bedroom uses a thicker fabric.