We are developing a dynamic textile wall hanging as an interface to the atmosphere of a room. Atmospheres are elusive. An atmosphere is the result of an ongoing negotiation between the activities in the room and the expression of the material objects, the lighting, the temperature, and the boundaries of the room [4, 8]. The wall hanging will play an active part in that ongoing negotiation. The activities in the room will influence how the textile wall hanging changes structure, form, color, as well as the pace with which it happens, and the activities in the room may in turn be influenced by the expression of the wall hanging.