The color of the silver foil changes to represent twinkling stars. The expression changes depending on the type of light and the angle of the light, such as natural light coming in through a window, sunset light, or warm lighting at night. The foil is coated to prevent discoloration, but the color will gradually change over time. We hope you will enjoy this change as well. The sign is on the reverse side so that you can choose the length, width, and height according to the atmosphere of your room.