Anyone who has lived (or does) in Europe will appreciate the multi-functional possibilities of typical windows, able to fold out like doors or flip down for ventilation while maintaining security.

This design by Fakro takes the concept concept to the next level – specifically, on your angled rooftop – creating more space and the feel of an exterior deck.

The top flips up to form an overhang, while the bottom folds out to let you walk right up to the edge and essentially stand outside. Particularly considering how much space a sloped ceiling can take up, it could be a marvelous addition to many second-story bedrooms and living rooms.