I wonder how many signs I see on an average day. They are everywhere! From giant billboards telling me what I should buy to tiny leaflets asking me if I want guitar lessons to just plain, boring signs telling me to slow down or where the exit is located. We don't really think about it, but I bet we read the equivalent of an average book chapter just while walking down the street. But every now and then, we come across a sign that just makes us stop in our tracks. A sign so baffling, all we can…