“…tangible computing has been explored, largely, as a practical exercise. Most prototypes have been developed opportunistically, driven as much by the availability of sensor technology and the emergence of new control devices as by a reasoned understanding of the role of physicality in interaction. We have various clues and pointers, but there is no theory of tangible interaction.” (Dourish, P. “Where the action is” p.52)

“Creation of a thing, and creation plus full understanding of a a correct idea of the thing, are very often parts of one and the same indivisible process and cannot be separated without bringing the process to a stop.” (Feyerabend, P. “Against Method” p.17).