1. A system for combining an overlay image with externally-displayed visual content, the system comprising: a tracking module to receive alignment information; an image generator module to generate said overlay image, and to align said overlay image using said alignment information; and a personal display module to superimpose said overlay image over a view of said externally-displayed visual content, wherein said alignment information provides relative orientation of the personal display module with respect to an area where the externally-displayed visual content is displayed.