## 1 Introduction
* Devices that connect to the gaming console (Sony PlayStation VR)
* Immersive rooms-CAVE (C-Automatic Virtual Environment)
* Large monitors
* Portable VR devices that use a mobile phone as a display and processing unit are being taken off the market, and current development is focused on portable stand-alone HMD devices and wired HMD devices, which offers greater graphic fidelity over the portable devices. The wired HMD device is connected (with a cable or special wireless adapter) to the powerful computer, where all CPU and GPU processing is being made. The HMD serves as a display device and primarily consists of high spatial and temporal resolution (dual) displays, allowing for high-fidelity stereoscopic image rendering [10]. Sound is being played with the integrated binaural speakers or by the connected headphones. HMD devices also have integrated hand/body and space (for room-scale experience) tracking and, with some devices, even eye-tracking. Interacting in the virtual environment is possible with the complementary controllers. Some newer devices also utilize hand-tracking and voice recognition as an option. While first generations of VR HMD devices had only three-degrees of freedom (dof) tracking capabilities, limited resolution, and field-of-view, high and noticeable motion-to-photons latency, tracking latency, flicker, etc., the latest commercially available devices have built-in state-of-the-art technology, which includes fast and pixel-dense displays; advanced motion-tracking (head, eyes, hands, and body); artificial intelligence; etc. The latest devices have built-in inside-out tracking systems with integrated cameras, without external sensors, where the setup sometimes could be cumbersome and not suitable for easy transportation. Still, the problem with VRISE was only partially solved with technology improvements, as the device is one of the three factor clusters that have an effect on VRISE (besides individual and task factors) [6; 11]. Since individual factors cannot be overcome, the main focus of developing VR experiences with no or minimal side effects should be on task-related factors. When this study was performed and the results were analyzed, it was during the time of Coronavirus disease 2019 (COVID-19) lockdowns, social distancing, and travel restrictions. The usage of VR technology is extremely helpful in a situation like this. It helps people virtually and immersively discover the world, virtually connect with friends and family, and that way, the time of being at home most of the time passes easier. VR was already proven as a helpful medical tool and is used to alleviate depression and boost moods, which is a common side effect of staying at home and not socializing for a prolonged time. VR technologies are used in many fields, for home and business uses, education, training, entertainment, industrial design, architecture, etc., and can increase the human-computer bandwidth. There are multiple theories of why VRISE does occur, and more than 40 factors have been discovered [12] that influence VRISE. Our study is based on the Rest-Frame Hypothesis (RFH) [13], which offers an alternate theory on motion sickness, where the emphasis is on the role of spatial-perceptual references affected by reference and rest-frames. A Reference Frame is a coordinate system with respect to which positions, orientations, and motions can be judged. Rest-Frame is the particular reference frame that a given observer takes to be stationary [14] and judges other motions relative to. Rest-frames can be defined as the vertical references provided by visual and idiotropic vertical cues, which are relatively stationary to subjects [15]. The rest-frame is considered one of several reference frames that the nervous system has access to and provides the observer with spatial information of stationary objects [16]. Under normal conditions, one of these is selected by the nervous system as the comparator for spatial judgments (selected rest-frame). In some cases, the nervous system is not able to choose a single rest-frame [14].