Look at the picture. When the man moves his joystick to the left, the helmet on the girl's head pulls her left ear, signally that she should go left. When he moves his joystick to the right, the opposite occurs.
Thomas Ricker of Engadget speculates about the most obvious application for this device from Kajimoto Laboratory: a navigation aid for the blind. With a GPS system added, it could be used to give the visually impaired greater independence.
Four years ago, Alex wrote about a similar gadget.
Link (Google Translator version) via Engadget