Here is a video about a haptic pad that touches you back. http://cnettv.cnet.com/senseg-demos-prototype-touch-feedback-technology/9742-1_53-50115714.html?tag=cnetRiver
Text about haptics interactivity:Â http://www.cim.mcgill.ca/~haptic/pub/VH-HFM-01.pdf
Also about Firefader, the haptic musical fader device:Â http://smcnetwork.org/system/files/smc2012-250.pdf