Leaving a window open may result in a refreshing circulation of air, but it is not as refreshing as the Original Breath by Yu-Cheng Wang. Not to mention purifying. Essentially, it is an air purifying system that attaches to the window to really filter what is entering the home.
Minimalist enough to complement just about any home, the Original Breath by Yu-Cheng Wang does most of the work outside of the house. The external part consists of a solar panel (to power a mini suction fan), an outer glass and plants. The solar panel generates enough energy to power the fan, which blows filtered air into the room. The air is filtered through the plants, which absorb carbon dioxide and expel oxygen.