FishFace is a gestural input device with proximal visual feedback. It detects motion using a "LazyFish" electric field module, and displays graphics on an array of LED's. The integration of the display and sensing creates the illusion that the user is interacting directly with the pixels illuminated on the screen. FishFace devices can be used as interaction surfaces in a variety of environments.
(Source: http://tangible.media.mit.edu/projects/fishface/)