TOP: If you look left with a normally oriented head, it becomes upside down. BOTTOM: Conversely, if you look left with an upside down oriented head, it has the correct orientation. MIDDLE: Using an upside down head costume and a costume switch keeps the head pointing in the proper orientation no matter which way you are looking. Move the mouse to look in each direction, or rotate in a big circle around the sprites to see the effect. The middle costumes is okay in both directions.