Fluxa is a compact wearable device that exploits body movements, as well as the visual effects of persistence of vision (POV), to generate mid-air displays on and around the body. When the user moves his/her limb, Fluxa displays a pattern that, due to retinal afterimage, can be perceived by the surrounding people. We envision Fluxa as a transient wearable display to foster richer self-expression and communication in daily life . It can be used to enhance existing social gestures such as handwaving to get attention, as a communicative tool that displays the speed and distance covered by joggers, and as a decoration device that generates images around dancing bodies.