The portal's manifestation at the top of the mobile device supports 'flicking over' interaction, like playing cards. Each portal visually associates a mobile device and its user with a place on the collaborative surface. Touching a tag initiates a trans-surface portal. In the present embodied trans-surface interaction technique, a peripheral NFC tag array provides tangible affordances for connecting mobile devices to positions on a collaborative surface. Embodiment means using spatial relationships among surfaces and human bodies to facilitate users' understanding of interaction. Trans-surface interaction addresses moving information objects across multi-display environments that support sensory interaction modalities such as touch, pen, and free-air. The design of clear interaction through affordances and feedback plays a key role. Expression through movement forms the basis of an interactive environment in which participants collaborate to create design. In this research, human movement serves as the basis for human computer interaction, social interaction, and visual imagery. Choreography is the creation or specification of movement in order to affect a specific intention and convey meaning. Gesture can be utilized to develop expressive vocabularies that form a basis for the interaction between humans and machines. Even outside of formal linguistic structure, gesture is a significant mechanism of human to human communication. Sign language is an example of a gestural system. A gesture is a linguistic form of movement that communicates without the use of vocal articulation or written language. Movements articulate locomotion, and also convey information regarding emotions and intentions. Movement is an actuated essence of people's everyday experiences. We sense the environment, form understandings, and actuate responses. CONCEPT Research on human computer interaction involving computer vision-based motion tracking needs to start with the body, and then consider technology. Our study demonstrates that movement-based affordances promote social interaction. We prepared a mouse-based version of the design environment, and compared how people experienced it with the movement- based system. This mixing of events produced an engaging environment in which participants could choose to interact with each other, as well as with the design environment. How can we evaluate socially motivated interactive systems? To create a context for evaluation, we held an integrated exhibition, party, and user study event. Jumping, a quick movement, and crouching, a sustained gesture, were choreographed to form a vocabulary that is personally expressive, and which also facilitates automatic recognition. Through an integrated and iterative design process, we developed a new type of affordance, the choreographic button, which integrates choreography, gesture recognition, and visual feedback. We discovered that the design of clear affordances is no less important in movement-based than in mouse-based systems. Movement became the basis for the choreography of gestures, the development of gesture recognition, and the development of imagery and visualization. We employed off-the-shelf computer vision technology. Our intention was to promote social interaction and creative expression. We used human movement as the basis for designing a collaborative aesthetic design environment.
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