A way of visually informing people of the boundaries of your personal space/your preferences for closeness of people interacting with you. Its an LED/laser beam-ish ring around your body that you can adjust the width of with the sleek wristband that has + and - buttons. Maybe there's a etting to make it more of a forcefield in dangerous situations. But maybe in a utopia these dangerous physical situations don't exist...[not sure not sure]