The Glyphs code in the Fringe episode Night Of Desirable Objectsspelled out MIRROR, which is a reference to the "magic mirror" used by the shape shifter to communicate with the alternate reality. It could also be a "Through The Looking Glass" reference, like in the Fringe Season 2 poster.
Here you will find screen captures of each episode of Fringe which are of special interest and/or that contain easter eggs. Easter eggs are hidden content intentionally inserted by the creators of Fringe. If you would like to request a screencap, you can do so by leaving a comment here.