Galvanic Vestibular Stimulation

http://www.youtube.com/watch?v=jPeWwvsnaaQ
http://www.junji.org/saveyourself/index.html

http://www.youtube.com/watch?v=Kf0E9llkZIU
http://www.youtube.com/watch?v=guaiDZdsDjI
http://www.hi.mce.uec.ac.jp/inami-lab/local/siggraph2005/Shaking_the_world.pdf

http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pubmed&pubmedid=10358131

http://en.wikipedia.org/wiki/Galvanic_Vestibular_Stimulation