Green in the house has so many advantages, and a vertical green wall is a way of having green in the house in a present-day way. Especially for city dwellers whom are losing the contact with nature: a living wall is a great way to get this connection back. A green wall has great acoustic qualities, and the plants increase the oxygen level in the room. Certain walls need maintenance (most regular plants) others don't even need sun light (like the moss wall of the first picture). We are sold on the idea of vertical green, and expect to see a lot more of it in the coming years.