Necomimi, a mashup of the Japanese words for cat and ear, is a new device that lets you express yourself visually through your thoughts. The ears, which you wear on your head, are connected to a strap that touches your forehead. By reading the electric impulses in your mind, the device attempts to express your current mental state through the position of the ears. When concentrating, the ears spring up. When you relax, the ears droop. They can also read other emotional states and move back and forth to match. While the practical use of the device is purely aesthetic, the technology itself has applications….