Bruce Richardson Krispin Leydon Mikael Fernström Joseph A. Paradiso Z-Tiles: building blocks for modular, pressure-sensing floorspaces. 1529-1532 2004 conf/chi/2004a CHI Extended Abstracts http://doi.acm.org/10.1145/985921.986107 db/conf/chi/chi2004a.html#RichardsonLFP04