Paul Dourish's work on tangible and embodied interaction is proving to be a big inspiration.
This quote hints at the kind of seamless feedback loops I aspire to create:
"In the everyday environment, "input" and "output" are fundamentally interconnected. This is a critical feature of the tangible media explorations. They should be characterized not in terms of "input" or "output," but in terms of the coordination between phenomena; between activity in a space and the pattern of light on a wall, or between the movement of objects on the desk and the information presented there. This sort of coordination, or coupling, is fundamental to the explorations presented here; they depend upon it for the casual illusion they want to maintain."
Paul Dourish, Where The Action Is: The Foundations of Embodied Interaction