A scattered mess of oddly shaped, light-colored concrete rocks lays outside a makeshift parking lot at the construction site of the new St. Raphael the Archangel Catholic Church on Route 45 in Old Mill Creek.

From afar, there’s no way to notice that each one of those blocks of concrete rock, many of which are still secured together with an aluminum tie, reveal two sets of numbers; one carved into the stone, the other colored in black.

The rocks are the carefully dismantled fragments of the facade of the church of St. John of God, a nearly century-old church building in Chicago’s South Side.