“…Fully immersive VR is completely filling the user's field of view with a head-mounted display. Although a huge amount of VR content comes from video games and the entertainment industry, VR offers the chance to many areas of education [3] from STEM, medicine, and humanities for various visualisations (big data, difficult structures, prototypes, human anatomy, digital heritage, etc.) [4,5,6,7] to practical training courses especially if a real system is very expensive or poses hazard/health risks or does not even exist (flight, driving, or maritime simulators, firefighting, factory operations, etc.)…”