“…(4) Fourth, we considered engagement though the aspect of visualisation. Since science often deals with the unobservable, visualisations available through VR are particularly valuable in scientific domains where concepts are difficult or impossible to perceive directly (Bakas & Mikropoulos, 2003;Brinson, 2015;Kersting, 2020;López & Pintó, 2017;Smetana & Bell, 2012). Scientific entities are sometimes too small, such as atoms and DNA molecules; or too big, such as stars and galaxies; they unfold over timescales that are hard to grasp, such as chemical reactions or evolutionary processes; or they are not directly observable in the physical environment, such as the Earth's axis and orbit around the Sun or gravity as the curvature of spacetime (López & Pintó, 2017;Pande & Chandrasekharan, 2017;Steier & Kersting, 2019;Sullivan et al, 2017).…”