Toshiki Sato Haruko Mamiya Hideki Koike Kentaro Fukuchi PhotoelasticTouch: transparent rubbery tangible interface using an LCD and photoelasticity. 43-50 2009 UIST http://doi.acm.org/10.1145/1622176.1622185 conf/uist/2009 db/conf/uist/uist2009.html#SatoMKF09