ORBS, etc.

http://www.coasttocoastam.com/photo/view/creating_an_orb/46300
http://www.youtube.com/watch?v=N71PXxydjl4&feature=related
http://www.angelsghosts.com/orbs.html
http://www.youtube.com/watch?v=3ujiLpaa624&feature=related
http://www.ufopsi.com/articles/orbs.html
http://memory-alpha.org/wiki/Orb
JPW ~ http://www.youtube.com/watch?v=yPDN3JT_Trc
OR~BS
Sometimes its more that just a trick of optics.