The computer was invented as a tool to assist intellectual production, so-called desk work. Therefore, the computer needs a work surface such as a desktop, laptop, or palmtop. However, computing that does not use a « top” (e.g. Augmented Reality, Ubicomp, and Tangible User Interface) has been proposed since the last century. Recently, these researches are rapidly penetrating our society due to the spread of smartphones and the VR HMD boom.
For computing without a “top », an interface that can be used in midair and that does not require a “bottom” for mounting on the top of a working surface will be needed. Therefore, we developed Bottomless Joystick which provides the same kinetic sensation in midair as an usual joystick.