A head-mounted display device may display a notification artifact for another display device. Using image data of a physical environment, a three dimensional model of the environment may be generated. Locations of the head-mounted display device and the other display device within the model may be determined. Notification data for the other display device may be received. Based on the location of the other display device relative to the head-mounted display device, the notification artifact for the other display device may be displayed within the physical environment.