(You) Illusion (were) Translation (Thinking) and (This) Reality 

The gallery has been turned into a mechanical eye and brain.  On the left side of the gallery is the world that actually exists: Reality.  Reality is observed by the mechanical eye (video camera) and translated digitally to the mechanical brain on the right side of the gallery (projector) which then attempts to accurately describe the Reality its eye observed.  Much like its biological counterpart, this mechanical translation is inherently flawed.  Instead of a perfect reflection of Reality, the mechanical mind gives us a depiction of the world that is vague and skewed. 

As the projection falls upon the darkened side of the gallery, it lands upon cardboard facsimiles of the objects represented.  These objects follow the distortion of the projection, completing the mistranslation of reality while drawing focus to the extent by which the projection fails to meet the reality it would depict.  This flawed image of the world is a far more accurate depiction of the world in which we operate than the world of Reality.    As the two lights in the gallery simultaneously dim and brighten, the differences between the two halves of the gallery are thrown into sharp contrast.  The actual objects on the left remain, while the objects on the right become featureless cardboard shells as the facsimile bulbs faintly glow with the remainder of the projected light.