The material research is focused on bending behavior and bending actuation to design a system which can react on environmental influences such as humidity. The research is based on active bending behavior which can be found in organic materials as for instance wood. The deformation of wood is affected by several factors such as grain direction and material expansion. The objective is to focus on the expansion of different materials to trigger bending deformations. As yet I concentrated on controlling the deformity of materials by controlling the expansion of an active material. The aim is to create a material system activated by water which reuses the absorbed water for cooling. The focus is to design some kind of a breathing system that can react on environmental factors to improve the air conditions inside a building.