User blog comment:William Wartique/wall of flesh/@comment-90.145.108.101-20111230183357/@comment-68.32.84.16-20120101084052

The direction from which the Wall of Flesh approaches is determined by the direction you are facing when throwing the doll into the magma. When you throw the doll in, the Wall of Flesh will appear just offscreen in front of you and move towards you. If you are facing right when throwing the doll in, the Wall of Flesh will appear to the right of the screen and move left. If you are facing left when throwing the doll in, the Wall of Flesh will appear to the left of the screen and move right.