Marianne Graves Petersen Peter Gall Krogh Martin Ludvigsen Andreas Lykke-Olesen Floor interaction HCI reaching new ground. 1717-1720 2005 conf/chi/2005a CHI Extended Abstracts http://doi.acm.org/10.1145/1056808.1057005 db/conf/chi/chi2005a.html#PetersenKLL05