William W. Gaver Andy Boucher Andy Law Sarah Pennington John Bowers Jacob Beaver Jan Humble Tobie Kerridge Nicolas Villar Alex Wilkie Threshold devices: looking out from the home. 1429-1438 2008 CHI http://doi.acm.org/10.1145/1357054.1357278 conf/chi/2008 db/conf/chi/chi2008.html#GaverBLPBBHKVW08