I like this device its good way to show it when you try to explain existence of energy to someone new and what is all about in practices of energy manipulations.
http://www.youtube.com/watch?v=kQ4a_Gu4 ... re=related
http://en.wikipedia.org/wiki/Kirlian_photography
http://www.youtube.com/watch?v=kQ4a_Gu4 ... re=related
http://en.wikipedia.org/wiki/Kirlian_photography