This only has one side because the back is blank.  If it’s not already obvious, it’s a guardian angel watching over two (?) children as they traverse … a bridge you wouldn’t expect two children to be traversing.  Either way, their guardian angel is watching over them, guiding and protecting them on their way.  Even though we can’t see them, we ought to foster a devotion to our guardian angels.

“Angel of God, my guardian dear, to whom God’s love commits me here, ever this day be at my side, to light and guard, to rule and guide.”