Lights Out is a book about the impact of light pollution on humans from the perspective of history, daily life, and behavior.

I always feel relaxed when I see the stars in the endless night. But in the city, due to light pollution, I have no chance to see the stars. I can only see the concrete forest, the gray sky, and the bright street lights. Sleep quality is also often ruined by the light that shines into a room, causing me to always feel helpless and stressed. This led me to design a book to help people become aware of the negative effects of light pollution.