In the night we need the light when doing anything in everywhere. When we want to go around at home. We need to turn off the light where we stayed and turn on the light where we will be in. Lots of energy is wasted between the actions. Even if we may forget to turn off the unused light. The concept of cupule light is to make people bring the light everywhere you need. It can stick on flat surface like windows or bookshelves. You dont need to turn on extra light and can do activities everywhere you want. Cupule light is not only convenient but also environmental.