Bonus fail - MC Escher gives instructions

Well, it's either graphic artist MC Escher or Julie. I found this picture over on My Confined Space, which is well worth a look-see. To the sign - you want to be able to leave the building in a safe manner if there's a fire, don't you? In that case, clear instructions for keeping the staircases clear are essential, aren't they? Just a pity this isn't going to help matters...

Really? Do you really, really think so? Because I don't.