Comment Depends on how you turn around to see the image (Score 1) 57
The direction it reverses is based on how you turn around to see the image. George Gamow explained this. Rotate a book around the vertical axis (yaw) and the text is correct top-to-bottom but reversed right-to-left. Rotate it around the horizontal axis (pitch) and the text is correct left-to-right but reversed bottom-to-top. This applies to how the observer turns around to see his/her image as well -- either by rotating around on your feet or by flipping over and standing on your head.