Puzzle Answer
Notice that in the right hand image, my eyes and mouth have been
flipped upside down. For some reason, this is not so apparent when the
rest of the face is turned upside down as well. Perhaps this suggests
that one way people identify an image is a face is by looking for a
specific arrangement of parts, without checking that the orientations
of those parts match the orientation of the overall object.
Go back to the puzzle.