I. Introduction
As a result of recent advances in three-dimensional (3D) video technology and stereo sound systems, virtual reality (VR) has become a familiar part of people's lives. Concurrent with these advances has been a wealth of research on touch interface technology [1], and educators have begun exploring ways to incorporate teaching tools utilizing touch properties in their curriculums [5], [6]. However, when used as teaching tools, it is important that a touch interface provide a “feel” that is as close to reality as possible. This will make replacing familiar teaching tools with digital media incorporating VR seem more attractive.