Design of an ARBased System for Group Piano Learning Based on the fact that most systems that support piano learning only focus on selfstudy and ignore the piano class learning situation, we propose an ARbased system to support live group piano learning. The system has two modes: formal learning mode (FLM) and group competition mode (GCM). The first mode, FLM, is designed to allow students to observe teacheru0027s key pressing and finger movement directly from their HMDs so as to enhance mutual understanding between the two parties during the learning process. The second mode, GCM, is developed to further ignite studentsu0027 passion on learning piano via competition among students. Our goal is to exploit AR technologies for enhancing the learning fun and enthusiasm of beginnerlevel students on a group piano learning situation, and thus ultimately provide students with a great learning experience.

Hand ControlAR: An Augmented Reality Application for Learning 3D Geometry The traditional way of learning geometry cannot provide a great support for novice students since the geometric figures are 2D on the blackboard or the book. In consideration that Augmented Reality(AR) provides an intuitive way to learn geometry, an interactive AR system that enables students to naturally and directly manipulating 3D objects through hand gesturebased interactions and intuitively explore the spatial relationship between spheres and polyhedrons is proposed in this paper. The proposed gesturebased interaction enables the user manipulate AR objects in the real 3D space instead of 2D space. We design three levels of study to enable students to learn the geometric concepts as well as an experiment to evaluate the effectiveness of the AR system. Analysis of experimental results showed that the proposed system is easy to use, attractive, and helpful for students.