New augmented reality display systems are provided, including a new form of mediated reality techniques, known as “shifted-reality” techniques. In some embodiments, an augmented reality display system includes a matrix of light-augmenting pixels within a variable-transmission, semi-transparent screen and creates redirected, attenuated and augmented light to form and alter virtual objects. In some embodiments, a plurality of angle-alterable, shiftable sources aid in creating virtual, 3-D objects of greater realism than conventional 3-D imaging methods, and in reducing the appearance of other objects or conditions. In these aspects, existing images and objects may be shifted in perspective for an observer, and enhanced and overlaid with effects and demonstrative information related to viewable objects and a surrounding environment. In other aspects, the system builds and accesses an object structure and materials library, and object inventory, to enrich a user's 3D experience using an augmented reality display system.