If you have small or closed spaces in your home, there is something you can add to the room to make a big improvement. Mirrors.
For windowless rooms, adding a mirror makes it feel much brighter and more spacious. Especially if you choose a frame design similar to a window frame, creating the artful illusion of a window in the space. You can also improve the amount of light in closed spaces by placing a mirror behind a lamp, spreading the light across the room to brighten up darker spaces.
Not only closed wall rooms benefit from this trick, but even smaller rooms that do have windows can also be greatly improved. A mirror effectively doubles the visual space. This is especially powerful when used at the end of hallways, making them appear far longer. Make sure to position these mirrors carefully so that they will play off light from the natural windows.