This is very clever. Of course, they will need to move the signs slightly every day, as the alignment of the 12-1 o'clock hour will change with the seasons. A

This is very clever. Of course, they will need to move the signs slightly every day, as the alignment of the 12-1 o'clock hour will change with the seasons. Also, what's preventing someone from taking a picture at the proper time and posting that photo on the internet?