When putting on one of these rings, the wearer instantly looses sight of everyone else who is wearing a Ring of Mutual Exclusion. It has no effect whatsoever on anyone else, so anyone not wearing a ring can still see, smell, and hear the wearer. Wearers cannot sense each other in any way, cannot see items carried or worn by each other, and sense all tactile sensations when feeling or bumping into each other.
Each ring looks identical, but each ring is actually unique. While appearing to be plain silver, there are hundreds of slight color variations that only a keen eye could detect. When dropped onto a stone, each ring chimes with a certain tone. These tones are nearly indistinguishable, but most musicians could probably tell the tones of two rings apart. Finally, a ring could be any size. While some rings share a color and some other rings share the same size, each rings has a unique combination of color, tone, and size.
Additional Ideas (6)
Often when a classroom is full of unruly students, it can become difficult for a teacher to maintain order while teaching an effective lecture. In cases like these, instructors often require each student to wear a Ring of Mutual Exclusion during the class period. This makes each student feel like he or she is the only student in a large, empty classroom. The instructor usually finds this a much easier environment to teach in. The professor will occasionally slip on a ring for a second just to see if any of the students aren't wearing theirs.
Some of the more eccentric thrill seekers will arrange for as many as a dozen gladiators to fight to the death in a small arena while each is wearing a Ring of Mutual Exclusion. Each combatant is unable to see his opponents or even feel them until, by randomly swinging his sword, he finally draws blood. An archer is usually hired to wear a ring and oversee the combat. If a contender should remove his ring, he would instantly become veiwable by the archer and subsequently shot until he died. Such tournaments often attract a large bidding competition.
Easter Egg Hunt:
During a race or scavenger hunt, the overseer will often require the competitors to wear Rings of Mutual Exclusion to provide a little more viewing pleasure. Racers will often run into each other and fall to the ground without feeling the collision. The resulting humor is often very gratifying. In a scavenger hunt, one seeker could be reaching for an item only to have it disappear in front of his eyes when another seeker grabs it first.
Clever judges use Rings of Mutual Exclusion to allow all of the witnesses and suspected felons into the same room without them hearing each other. A guilty criminal usually becomes very nervous when the judge asks a potentially convicting question and the answer given is completely unheard. The guilty often break down and confess when witnesses don't have anything useful to say. The tension it creates is a very useful tool.
A patient thief looks for someone who owns a Ring of Mutual Exclusion. When she sees someone wearing a silver ring, she will slip on her own ring for a moment to see if the target disappears. Once she knows that someone owns a ring, she just has to wait outside his house while wearing her ring until she can't hear or see the target. She can then steal all she wants at her leisure, but if she takes too long, the target may notice items disappearing into thin air.
Either through choice or Court Order ex's may be ordered to wear these rings to stop them argueing with, stalking or otherwise hurting each other.