What's your orientation?

On a recent flight, the sign on the left caught my attention. What was that huge thing between the two people? Lots of cues help us "read" abstract signs. Things like shape, scale, proximity, etc. But this thing was as big as a person! The more that visual cues point us to the "real" characteristics of what is being symbolized, the better the chance we have of "reading" them. Why not rotate the seat belt to the orientation that its normally used: horizontally across a person's body?