New lighting technologies create new opportunities that may contribute to people's experience of light. These opportunities are a result of the increased variety and freedom in terms of colour, form factor and connectivity of the lights. To allow people to fully benefit from the potential of such novel lighting systems, there is a need for a new user interaction paradigm. To develop this paradigm, we have to better understand the aspects that play a part in the interaction with lighting, paying special attention to people's motivation for interaction. This paper reports on a context-mapping study that was performed to gain insight in these aspects. As result, we present a set of seven themes that regard the interaction with lighting in the current situation and in the future. These themes provide an overview of the relevant aspects in this domain and contain considerations and opportunities for the design of new interfaces for novel lighting systems. We conclude that people have different levels of lighting needs that are highly dependent on context and that also require control at different levels. The context and lighting needs have a large influence on the extent to which people are motivated to adjust their lighting. Moreover, the lighting interface itself has a large effect on this motivation, mainly influenced by the degrees of freedom, the control location and availability, the degree of automation and general interaction qualities.
In the past decade, the field of Tangible Interaction (TI) has gained significant interest. As a result, numerous systems, theories and frameworks have been developed with this vision in mind. This has led to various instantiations of TI that seem developed to make digital information tangible, rather than to optimally use and combine all important qualities of TI. We believe that TI has more to offer than what has been used advantageously so far. Therefore, this paper reflects on the foundations of TI and identifies three qualities of control and representation in TI based on existing systems, theories and frameworks.
LED-based lighting systems have introduced radically new possibilities in the area of artificial lighting. Being physically small the LED can be positioned or embedded into luminaires, materials and even the very fabric of a building or environment. Hundreds of LEDs can be used in a single luminaire or space, of which each could have different light output properties. The light switch therefore in many situations will need to be enhanced or fully replaced by intelligent controls and smart environments that are sensitive to the context and responsive to the people in the environment. The focus of this workshop is to explore new ways of interacting with light where lighting is no longer simply an on or off system, but a flexible system capable of creating a large range of functional, decorative and ambient light effects.
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Contemporary lighting systems may consist of many individual light sources that can be controlled on various parameters (e.g. intensity, color, spatial position). Therefore, opening up freedom of control to the user in a comprehensive manner is a challenge. We present a lighting system with three different interfaces that suit different usage scenarios in terms of control effort and freedom. The system consists of modular ceiling tiles ( fig. 1) for down-lighting and colored wallwashing for atmospheric lighting. The LightPad ( fig. 2a) allows people to quickly adjust all light sources with an expressive touch; duration and force determine respectively the light color and intensity. This could be used near the entrance of a space to quickly set the lighting. The LightCube ( fig. 2b) allows users to choose between various presets that are related to different activities. The top-facing preset is activated. The LightApp ( fig. 2c/d) is a tablet interface that allows users to control many light sources in detail using simple gestures: dragging, pinching, rotating and wiping. This could be used to create specific atmospheres, or to create presets for the LightCube. { r.magielse, s.a.m.offermans @tue.nl } fig 2. The interfaces; a) LightPad, b) LightCube, c/d) LightApp fig 1. The modular ceiling Video Showcase CHI 2013: Changing Perspectives,
Industrial Design is concerned with the design of intelligent products and services. When designing these products and services, emotional mediation could be a key aspect in intelligent behavior [2]. In the field of industrial design not much attention has been paid to expressing emotions through movement. Because of this the potency of movement as message carrier and the language of movement were the topic of research. This evoked two questions: Does the addition of movement to objects enrich/enforce the emotional message of the objects? How does a context influence the emotional message of an object? In order to find the answer to these two questions, five vending machines were built. These machines were expressive in their movement and were meant for a specific context. The objects were created using the following idea generation techniques: collages, acting out, tinkering and 4D Sketching [1]. Finally a user test was committed to measure the strength of the message with and without movement. The difference between the strength of the message when the object is in its context and when it is not, was also tested.The result of this test shows an apparent relation between the addition of movement to a static object and an increase of the strenght of its emotional message. The presence of the moving object in its accompanying context does not have a relation, which is as apparent as the addition of movement. One must say though that the addition of a context and movement to an object still has a significant effect, showing that the presence of a context certainly hasn't got negative effects. With the results of this research, hopefully attention will be drawn to the importance of movement in objects that mediate a certain message.
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