When a character is pressed up against a sheet of glass or similar transparent surface. In many cases, the "fourth wall" of a scene (the viewer's screen) is treated as the "glass" that the character is pressed up against. Note: Posts tagged `on_glass` should only also be tagged with glass if the glass is apparent in the scene. In many cases the glass surface is implied, while this tag specifically references glass, it applies to similar content with other solid transparent or translucent substances such as ice or plastic. "On Glass" Tags:
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Posts tagged with `on_glass` and `*_on_glass` often inherently involve these...
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