  Watching others play is a key ingredient of digital games and an important
aspect of games user research. However, spectatorship is not very popular in
virtual reality, as such games strongly rely on one's feelings of presence. In
other words, the head-mounted display creates a barrier between the player and
the audience. We contribute an alternative watching approach consisting of two
major components: a dynamic view frustum that renders the game scene from the
current spectator position and a one-way mirror in front of the screen. This
mirror, together with our silhouetting algorithm, allows seeing the player's
reflection at the correct position in the virtual world. An exploratory survey
emphasizes the overall positive experience of the viewers in our setup. In
particular, the participants enjoyed their ability to explore the virtual
surrounding via physical repositioning and to observe the blended player during
object manipulations. Apart from requesting a larger screen, the participants
expressed a strong need to interact with the player. Consequently, we suggest
utilizing our technology as a foundation for novel playful experiences with the
overarching goal to transform the passive spectator into a collocated player.
