Talking of the bridge, there are three coins above the sign at the far end of the first bridge. (eurogamer.net)
I have seen people tapping on the glass directly above the sign that is on the same glass. (petbusiness.com)
God even tells us «And I will show wonders in Heaven above the signs in the Earth beneath, the sun shall be turned to darkness and the moon into blood before coming of the great and awesome day of the Lord.» (religion.blogs.cnn.com)