While players pretend their characters inhabit the same diegesis, this is a necessary illusion - no player can observe what the other players imagine, and hence diegeses are subjective and often inconsistent.
The concept has been used in Nordic larp theory to discuss questions such as the appropriate uses of music in larp, and what is really going on when people role-play. Most definitions of larp and role-playing utilize use the D-wordconcept.
== Further reading ==