Wow! It sounds like daydreaming thinking about controlling the light. No, it is not! It is true and of course you can try it by yourself. It is an ordinary thing if we are talking about sounds volume controlling or temperature controlling. It is because there is invented the properties to control that. But how about light controlling? The answer is easy and simple. Everybody knows about it, but they just never realize it. Window blinds that cover the window would be the controller of the sun light that enters the room.
As we know that sun light is the best light that we can receive. It is different to the light from lamp; the sun light also brings healthiness for body, of course when it is morning. While the day becomes noon, the sun light can be too shiny and burn your skin. That is why you can use the window blinds to give a little block for the sun light. This kind of window coverings sometimes makes window shades on the table according to the type of its blind. It can be horizontal blinds or vertical blinds. There are many halls and office rooms that choose the vertical blinds. No one knows why it can be.