Spatial Augmented Reality (SAR) systems can be suitably combined with other existing
Extended Reality (xR) technologies to support collaboration. In existing strategies, users
unencumbered by a viewing technology, such as a tablet interface or a head-mounted
display, must rely on the transmission of their collaborators' positioning through interpreting
a first-person camera view. This design creates a seam between a user's experience of the
augmented physical environment in SAR, and their collaborators' experience inside the virtual environment.

Irlitti A, Piumsomboon T, Jackson D, Thomas BH. Conveying spatial awareness cues in xR collaborations. IEEE transactions on visualization and computer graphics. 2019 Aug 14;25(11):3178-89.