This sign is on the edge of a steep cliff so this is probably why there’s a fence. Nonetheless, we think it’s quite extraordinary that Beijing authorities should even think of showing someone sitting on it, and then not telling them to turn around and get off again. On the other hand it could be nice to have your lunch while you enjoy the view. Apple turnovers are messy things. Perhaps this is just a polite request to stick to biscuits. After all, they did say “please”.