Quick edit to help pages load faster. The artifact is attached to the machine, and it appears that everywhere the machine exists, this artifact will probably exist. If we project the scale and position of this artifact to the main machine the middle, I believe this artifact is somewhere in the steam pipes behind the machine.
Therefore, it may just be a photoshop copy error. Alternatively, since this artifact is
only seen when we view an inverted representation of the machine, the top piece of it may be pointing at something. To me, the artifact kind of looks like a sign post.
Bottom:
Bottom Left:
Mid Left:
