After you’ve got over the initial where’s-it-coming-from confusion, natural light in a room without windows is a really cool thing. Skylights are no new invention (nor are pipe shafts to bring light in), but because Sunpipe has a reflective surface on the inside, it can go round corners. Even that dark, dingy bathroom landlocked on your ground floor is a candidate for bright sunlight. The pipe intensifies light, which is the diffused by a translucent disk on the ceiling (see extended post). Besides being more pleasant, natural light increases productivity and costs nothing. Monodraught also makes a version combined with their Windcatcher natural ventilation system. Via Eco-Design Handbook ::Monodraught [by KK]
Sunpipe gets all those hard to reach places.