p. 300-301
Intuition is a important factor of good interface. The relation between operation and result is not always same in usual GUl interfaces(such as icons and buttuns), because these interfaces are designed to adapt mouse and keyboard. So we first made the hardware to fit the use, and developed the entire interface. The "Fuwafuwa-Oekaki" is a 3dimensional drawing tool with exclusive input device. This system allow kids to draw 3D drawings intuitively. We designed the shape and the operating ways of device by reference to a real painting tools. The device recognizes the xyz coordinates by measuring the length of three wires.