Image credit Lloyd Alter
One of the simplest technologies for getting more natural light into an interior is the lightshelf; it bounces light off the ceiling instead of carelessly wasting it on the floor. I have thought that it might be a great thing in Graham Hill's apartment in the LifeEdited project.
Brightshelf throws a curve at the traditional flat lightshelf; this wave form on the top spreads the light out a lot farther, making a dramatic difference in the light penetration.
You can see the difference in this sketch. The unit also pivots for easy cleaning of the upper mirrored surface.