Here’s how scrying ‘works’ without getting into a metaphyisical discussion of energy projection across planes of conciousness: have you ever been walking alone at night on a long dark road? (or you can try this in your bathroom with the light off for that matter). Did you ever get the feeling you were being watched along that dark road? Ever THINK you saw something that wasn’t there? The intention of scrying is to use some object as a focus for your mind’s energies (yes, if you’re reading this, your brain will have some electrochemical energy). AS your brain relaxes, and your eyes start to look for objects to focus on, the objects of focus often take the form of clouds or a haze- stare at the monitor/tv for a long time without blinking too much… now look away, there’s the haze. Your mind goes into a meditative state in which it is HIGHLY succeptable to suggestion and outside influence. Ever wonder why you feel compelled to buy a set of Personal Wonderment and Well-Being tapes at 3AM? You’re in that state of mind. The ‘theory’ is that the images seen in the crystal ball/black mirror/ candle’s flame/ blank tv screen (yes, I’ve heard of these being used for scrying), etc. are images that your mind is cultivating anyway about the question you’re supposed to be focusing on. Everybody does this (minor hallucinating)- scrying is just more of a concious effort, and then the scryer(?) attempts to make some meaning out of what s/he saw.
WHY it works: I guess that the human desire to find patterns in everything and make sense of everything allows scrying, divination, etc. to work. Also, there’s a certain amount of belief involved. If you believe that staring into a crystal ball and focusing on the light inside, and then focusing on the haze and shadows, will tell you who shot Kennedy, or who your next lover will be, then you WILL find a way to make the images fit into your preconcieved notions.
Try the bathroom thing though- it’s kinda freaky in a cool sort of way.