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Virtual Reality (VR) provides immersive experiences in the virtual world, butit may reduce users' awareness of physical surroundings and cause safetyconcerns and psychological discomfort. Hence, there is a need of an ambientinformation design to increase users' situational awareness (SA) of physicalelements when they are immersed in VR environment. This is challenging, sincethere is a tradeoff between the awareness in reality and the interference withusers' experience in virtuality. In this paper, we design five representations(indexical, symbolic, and iconic with three emotions) based on two dimensions(vividness and emotion) to address the problem. We conduct an empirical studyto evaluate participants' SA, perceived breaks in presence (BIPs), andperceived engagement through VR tasks that require movement in space. Resultsshow that designs with higher vividness evoke more SA, designs that are moreconsistent with the virtual environment can mitigate the BIP issue, andemotion-evoking designs are more engaging.

Manifest the Invisible: Design for Situational Awareness of Physical Environments in Virtual Reality