This paper introduces a novel interface for digitallyaugmented cooperative play. We present the concept of the "athletic-tangible interface," a new class of interaction which uses tangible objects and full-body motion in physical spaces with digital augmentation. We detail the implementation of PingPongPlus, a "reactive ping-pong table", which features a novel sound-based ball tracking technology. The game is augmented and transformed with dynamic graphics and sound, determined by the position of impact, and the rhythm and style of play. A variety of different modes of play and initial experiences with PingPongPlus are also described. Keywords tangible interface, enhanced reality, augmented reality, interactive surface, athletic interaction, kinesthetic interaction, computer-supported cooperative play. INTRODUCTION When an expert plays ping-pong, a well-used paddle becomes transparent, and allows a player to concentrate on the task -- playing ping-pong. The good fit of grasp is vit...

this paper is organized as follows. Section 2 illustrates some of the uses of Intelligent Paper by discussing the scenario of a student reading a multimedia-augmented "Intelligent Book" publication of the play "Othello". Section 3 presents the underlying technology of Intelligent Paper. Section 4 shows further application examples. Section 5 introduces a few extensions and variants of the primary concept.

This thesis develops new approaches for people to physically represent and interact with aggregates of digital information. These support the concept of Tangible User Interfaces (TUIs), a genre of human-computer interaction that uses spatially reconfigurable physical objects as representations and controls for digital information. The thesis supports the manipulation of information aggregates through systems of physical tokens and constraints. In these interfaces, physical tokens act as containers and parameters for referencing digital information elements and aggregates. Physical constraints are then used to map structured compositions of tokens onto a variety of computational interpretations. This approach is supported through the design and implementation of several systems. The mediaBlocks system enables people to use physical blocks to “copy and paste ” digital media between specialized