Different ways of being interactive

The piece by Janet Cardiff and George Bures Miller got me thinking about different ways of being interactive. There are pieces which influence witnesses to DO something, and there are pieces which respond to the presence of a witness. The latter interests me because of the gentleness of it, the idea that someone just being near, looking at a piece of work would activate some kind of response from the work. This gives the impression that the pieces are alive, breathing, responsive. I would love to make work that brings people into a meditative space, without the need for action from the viewer.