# A Design Space for Virtuality-Introduced Internet of Things
## 1 Introduction  
Augmented reality (AR) and virtual reality (VR) technology have been advanced in the real world by introducing virtuality, which makes people believe in the existence of things that do not physically exist. VR technology has enabled people to enter and interact with immersive virtual worlds. This technology extends not only to gaming experiences but also various real-life services, such as rehabilitation, education systems for children with autism spectrum disorder and self-confidence services [1; 2; 3]. In addition, some digital services utilize mobile VR [4]. AR technologies attach information to the real world, and have been studied for a long time; for example, technology-enabled museum guidance displays digital objects in the real world [5], and book-reading experiences are augmented by showing virtual objects in a book [6]. PTC, a company that provides an AR development platform named Vuforia, developed a new platform named ThingWorx Studio, which combines IoT technologies with AR technologies [7]. For example, people can develop their own services to visualize data sensed by IoT devices using this platform. However, many of the services that are proposed do not seamlessly integrate the real world with the virtual world. In the area of health care research, particularly, it has recently become popular to use VR and AR technologies to develop advanced health services [8; 9; 10]. The virtual world is considered to divide the two worlds, thus these technologies are usually considered independently. We believe that it is necessary to seamlessly fuse virtual-world and real-world objects with AR and VR technologies in the real world. In this paper, we named the fusion world beyond the boundary of the two worlds \"Fusion Reality\". In the near future, VR technologies can be used to create immersive and more realisticvirtual objects that can be integrated into the real world through AR technologies, although the two technologies are currently separated. However, Fusion Reality is realized through the true combination of the two technologies. The following paragraph shows a typical example scenario realized by Fusion Reality:  
_[PERSON] wakes up in the morning as usual, then she unmouths her smart glass from a charging spot and wears it. The virtual agent character \"[PERSON]\" begins talking to her. He looks like a strange monster whose size is small enough to be held by her. The character is not so unusual after wearing a glasses-type display on a daily basis. She is notified of the schedule and the weather today by him, and she is gradually waking up. He tells her, \"Today is not hot, but it seems to be rainy; it will last until the evening, so you should bring your umbrella.\" She also tells him that she recently had lost her umbrella. He offers to lend his umbrella delightedly. He may feel happy because he can help her. He has an umbrella in the virtual world, and there is a physical umbrella that is the same design as [PERSON]. In addition to the umbrella, there are several of his own things in her house. One example is a ball toy that [PERSON] does not completely understand. He occasionally plays with it defly, for example juggling with it. Looking at his playing, [PERSON] is healed for a while, so she has not regretted buying it for him. She also practices juggling a little, but she stops because she cannot jugggle better. Recalling such a thing, she takes breakfast while watching the news displayed on a wall. After breakfast, she dresses in her favorite suit and goes to her office with [PERSON]'s umbrella._  
In the world that realizes Fusion Reality by coexisting objects and contexts of the physical world and the virtual world, virtuality is either explicitly or implicitly introduced into people's daily life, and information presentation and notification can be performed through the virtuality. Furthermore, it is possible not only to notify information but also to facilitate communication between people and make the game experience more realistic.