Borrowing from nature (Bio-mimicry) our walls are living walls. When placed on the south and west facing facades of buildings they act as a cooling system and reduce impact on energy use. They can also be used to filter and cleanse storm water.
An adaptation recently introduced is the living landscape retaining wall. We no longer need to build eyesore concrete retaining walls but can create walls populated with appropriate plant material that utilize all potential on site water by reabsorbing it into the water table. These walls breathe naturally, which increases the life of the wall materials.