I was watching this show on youtube called "Children of the Grave" and in the 7th part of 9 they talked about using a laser grid system to show how shadow figures have "mass" because the laser doesn't pass through them. I found it fascinating. Heres the part that I'm talking about: http://www.youtube.com/watch?v=GH9VvSo3 ... re=related Skip to about 6:50 into it. Theres some real interesting footage of lasers being blocked in mid-air by what appears to be NOTHING. Could be something new to experiment with on investigations.